A student was careful to make and stir all of her standard solutions immediately before measuring their turbidity for her calibration curve. However, she let her tap water solutions sit for 10 minutes prior to measuring their turbidity. If she measured the top portion of the solution, would her experimental sulfate ion concentration be higher or lower than it should be?
Q: A solution is prepared by mixing 50.0 mL of 0.50 M Cu(NO3)2 with 50.0 mL of 0.50 M CO(NO3)2- Solid…
A:
Q: Q1. Give three criteria for a good recrystallization solvent.
A: "Since you have asked multiple questions, I am solving the first one for you. If you need help with…
Q: Anna is performing a precipitation Gravimetry on her experiment. She weighed an exact amount of the…
A: Re-dissolving her sample with another solvent.
Q: To transfer a solution, the stirring rod touches the delivery point of the reagent vessel and the…
A: Since you have posted multiple questions as per guidelines we can answer one . If you want remaining…
Q: You are doing HPLC analysis to determine the concentration of vanillin in an artificial vanilla…
A: The full form of HPLC is high pressure liquid chromatography or high performance liquid…
Q: Explain how a Gravimetric Analysis is performed.
A: Gravimetric analysis is a class of lab techniques used to determine the mass or concentration of a…
Q: Preparing and Diluting Solutions Data Table Test Tube 1* 2 4 10ML/3.8mL 2.4mL SmL 1.53ML…
A: We are given the data for the concentration of different diluted stock solutions and their…
Q: If you choose a serial dilution—what would you do? Assume that you begin with a 1.0 M solution.…
A: 50% serial dilution translates to,1/50 dilution factordilution factor = initial volumefinal volume =…
Q: Name Post-Laboratory Questions (Use the spaces provided for the answers and additional paper if…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: What are the criteria for a successful determination in gravimetric analysis?
A: Gravimetric analysis is a technique through which the amount of an analyte (the ion being analyzed)…
Q: Why is it common practice to boil the solution near the equivalence point in the standardization of…
A: The reason is discussed as shown below, The reaction of sodium carbonate with HCl results to form…
Q: Find the following: 1. slope and intercept of the calibration curve 2. the mean concentration of…
A:
Q: Prepare the following solutions: 100.0 mL 0.0500 M stock Ca2+ solution 50.0 mL 0.0050 M working…
A: Given data, Concentration of stock solution = 0.0500M Concentration of desired solution = 0.0050M…
Q: Calculations: Determine the molarities of Solutions 1, 2, 3 and 4. Apply the rules of significant…
A: Solution: By defination, molarity is nothing but the ratio of moles of solute in given liter of the…
Q: An analyte has an Rf value of 0. 75 What does that indicate about the solubility of the analyte in…
A: Chromatography is a technique of separation Here we are required to indicate the solubility of the…
Q: 0.54 g phthalic acid fully dissolve in 100 ml water at room temperature. How much is phthalic acid…
A: Amount of phthalic acid dissolves in the amount of water is simply corresponding to the density of…
Q: Cryoscopic Determination of Molecular Weight Post-Lab Questions (40 Points) Name Lab Instructor 1. A…
A: Freezing point is a colligative property meaning it depends upon the amount of solute of ions…
Q: 1. In this method, the mass of the analyte or a compound derived from the analyte is determined. 2.…
A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: Data Sheet with Sample Results Note: results that require calculations are purposely left blank and…
A: Solution Mass of NaCl dissolved = (mass of beaker+stirring bar+NaCl)-(mass of beaker+stirring bar) =…
Q: The distribution constant for iodine between an organic solvent and water is 75. Find the…
A: Given the distribution constant, KD = 75 Volume of aqueous layer(water), Vaq = 100 mL molarity of…
Q: An analyte has a Rf value of 0.5. What does that say about the solubility of the analyte in the…
A: As we know, Rf value is nothing but ratio of distance travelled by solute to distance travelled by…
Q: V. Data and Results Given: 0.1 N standard NaOH solution Sample 1 1.3296 g Sample 2 0.78 g Sample 3…
A: Answer:- This question is answered by using the simple concept of stoichiometry which involves the…
Q: Solid-liquid extraction is an effective method to isolate a the desired soluble component in a solid…
A: Solid-liquid extraction is an effective method to isolate a the desired soluble component in a solid…
Q: A chemist receive different mixtures for analysis with the statement that it contain NaOH, NaHCO3 ,…
A: NaOH and NaHCO3 can't be present together in a mixture since they react to form Na2CO3. Thus,…
Q: Determination of the ppm Fe in a water sample using the iron-phenanthroline method. Presence of…
A: Given: Determination of the true concentration ppm (Fe) in a water sample using Iron-phenanthroline…
Q: Suppose that a volume of 5.0 cm³ of acetic anhydride (density = 1.08 g·cm⁻³, molar mass = 102.087…
A:
Q: For the CO2 impact experiment station: 1) Obtain two plastic cups, red cabbage indicator, a…
A:
Q: You want to make a solution of loading dye with a final concentration of 0.35% bromophenol blue,…
A: Part 1 0.35 % Bromophenol blue = 0.35% * 60 ml = 0.21 ml = 0.21 grams 0.15 % Xylene Cyanol = 0.15%…
Q: show how you are going to prepare your calibration standards.
A: WE need to prepare multiple solutions of 50 mL each using the 500 ppm stock solution such that the…
Q: If the value of the blank solution is equal to 7.0 g/cm3 while the salt concentration is 9.7 g/cm3.…
A: The Seta Salt in Crude Analyzer is a robust and portable instrument for determining the chloride…
Q: IF an analytical balance was not calbirated before gravimetry analyses, what will happen to the mass…
A: Instrument calibration is done so as to remove the unnecessary error in the analysis .…
Q: How is spiking used in qualitative analysis? Why are several different types of columns necessary to…
A: The technique of Spiking the sample involves addition of a known reference substance to a sample, in…
Q: Which statement about the determination of the percentage purity of benzoic acid is correct? *…
A: We have given statements , we have to choose correct statement
Q: 0.02 M NaOH reagent was standardized using 0.1000 g Potassium hydrogen phthalate (204.22 g/mol) and…
A: Given:- Mass of Potassium hydrogen phthalate = 0.1000g Molar mass of Potassium hydrogen phthalate…
Q: In chromatography, the compound that is least soluble in the mobile phase a) Travels the furthest…
A: When a compound is dissolved in the mobile phase it is carried along the direction of flow, but when…
Q: B. Determining the Composition of a Mixture of Sodium Chloride and Sodium Nitrate Partner I Prepare…
A: Given the mass of the solid mixture containing NaCl and NaNO3 = 0.103 g Given the w/w % of AgNO3…
Q: The distribution coefficient between methylene chloride and water for solute Y is 15. An amount of…
A: Distribution coefficient simply denotes how a compound is distributed in a mixture of two immiscible…
Q: Calculate the temporary and permanent hardness of water sample containing Mg(HCO3)2= 7.3mg/L,…
A: Given data: Amount of the hardness causing salts (mg/L) is given: Mg(HCO3)2 =7.3 mg/L Ca(HCO3)2 =…
Q: If the unknown well water samples were analyzed at 550 nm but the external standard solutions were…
A: Solution -
Q: How do we keep relative supersaturation low by controlling solute concentration?
A: ANSWER:-Option-3 is correct. 3.Concentration should be lower.
Q: of methylene chloride BA + NaOH --> sodium benzoate + H2O BA = 0.0205 M NaOH = 0.0189 M NaOH…
A: In the above we have to calculate the distribution coefficient K
Q: pLease help with all parts.
A: Step 1: To prepare a stock solution the molarity can be taken as: M1: molarity…
Q: I'm working on a pre-lab report for chemistry regarding retention factors. The question asks what is…
A: Retention factors are related to chromatography experiment. Retention factor is the ratio of the…
Q: Chromatography: Evaluating Pen Inks PreLab Questions Name Section 1. Observe the following picture…
A: When there is more than one sample, the TLC spotting technique must be carefully performed. 1. Do…
Q: An analyte has a Rf value of 1. What does that say about the solubility of the analyte in the…
A: As we know Rf value is nothing but ratio of distance travelled by solute to distance travelled by…
Q: Draw flow chart for the extraction of mixture containing a. Acid and Base
A: Given : mixture of an acid and base. To find : Draw a flow chart of acid base extraction. Solution…
Q: The first goal is to make the oxalic acid standard solution. You measure 1.5232 g of oxalic acid on…
A: Since, Number of moles of a substance is the ratio of mass of the substance to its molecular mass.…
Q: Identification Complete each statement. Write your answer at the end of each question. 92. To…
A:
A student was careful to make and stir all of her standard solutions immediately before measuring their turbidity for her calibration curve. However, she let her tap water solutions sit for 10 minutes prior to measuring their turbidity. If she measured the top portion of the solution, would her experimental sulfate ion concentration be higher or lower than it should be?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
- You want to determine the concentration of NaCl in a water. In preliminary analysis, it appears to be saline water with a NaCl content of approximately 4%. Should you dilute the sample if your titrant has a concentration of 0.1 M and you want to spend 25 mL of sample? Solution: You must dilute approximately ten times, taking 10 mL of sample and making up to 100 mL. In this way, 17.20 mL of titrant will be spent.Write your complete solutions on yellow paper, round your answers to the appropriate number of significant figures, and box the final answer. The deadline for submission is at the end of the class. Note: You do not need to write your solutions for the items that can be derived from your calculators. 1. Three students (Saerom, Hayoung, and Jiwon) are asked to determine the ppm Ca in a drinking water sample by titration with EDTA. Each student performed five trials for the sample. The results in ppm Ca are the following: Saerom Hayoung Jiwon a. Get the mean, SD, and % RSD of each student's results. b. If the true value is 35 ppm, calculate the relative error of each student's results. c. Comment on the precision and accuracy of each student's results. The maximum % RSD and the relative error set by the lab is 5.0%. d. Use the following table to summarize your answers. Mean SD %RSD Relative Error Comment 31, 32, 33, 33, 32 35, 34, 34, 35, 34 35, 38, 33, 35, 37 Saerom Mean SD 95% CI…Based on this student data, calculate the average molarity of the NaOH solution. Standard: KHP = potassium hydrogen phthalate, MM 204.4 g/mol Student Data Trial 1 E KHP mL initial: NaOH mL final: NaOH 2.02 0.57 19.25 Trial 2 2.05 19.25 39.80 Trial 3 1.99 1.65 20.75
- A sample (50 mL) of a bottled water was added to a 100 mL volumetric flask and then diluted to the mark. From this stock solution, 50 mL was taken, added to a 100 mL volumetric flask and diluted to the mark. Final concentration of the serial dilution: 587.7161ppm. 1. what is the concentration in the original bottle (ppm)You want to determine the concentration of NaCl in a water. In preliminary analysis, it appears to be saline water with a NaCl content of approximately 4%. Should you dilute the sample if your titrant has a concentration of 0.1 M and you want to spend 25 mL of sample?A forensic chemist is given a white powder by the investigator of a crime scene. The investigator wants to know if the powder is a pure substance or a mixture. The chemist dissolves some of the powder in deionized water making a clear solution. She finds that a precipitate forms when she adds an excess aqueous solution of sodium chloride. She filters the precipitate and washes it several times with deionized water. To this filtrate she then adds an aqueous solution of sodium carbonate. A precipitate forms. Question: Draw two pictures representing a molecular / atomic / ionic view of what occurred when a precipitate formed with the addition of sodium chloride solution. Choose the type of particle that is the most appropriate for this reaction. Place charges on any ions indicating charge values (+1, -2, etc.) when they are known. If charges are unknown indicate whether the ion is positive or negative. Clearly indicate which picture represents before the reaction occurs. Should…
- 50 mL of stock solution were taken and added to flask. Then 50 mL of Di water were added to the flask. This is solution 1. Then 50mL of solution 1 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 2. Then 50mL of solution 2 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 3. Then 50mL of solution 3 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 4. Find the concetrations of each solution. Information of stock solution - molar mass- 534.3g/mole 0.587g in MilliQDoes it possible to use gravimetric analysis to quantiify certain parameters as indicators of quality in squash soup? If yes, please explain the processWhy do Sedimentation and filtration is important in water treatment?Is a period of timeimportant in water purification?
- A student prepares a 1.2 mM aqueous solution of benzoic acid (C,H,CO,H). Calculate the fraction of benzoic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits. 0% DP de MA 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. You subject it to spectroscopic analysis, in order to get the concentration of amine in this compound. Next, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample, and you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. What is the molecular weight of the compound? (The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.)1. A solution is known to contain 38.04 ± 0.03 mM KCl, and you have taken an aliquot of this solution using a pipette calibrated to deliver 20.013 ±0.006 mL. Determine the number of moles of KCl that are delivered in the aliquot, including the absolute uncertainly in that value. 2. You deliver the aliquot taken in problem 1 into a volumetric flask with a volume of 250.00 mL ± 0.02 % and dilute the solution to volume in the flask using Dl water. What is the concentration of KCl in this flask, report your answer with the absolute uncertainty. 3. Tabulated below are replicate titration volumes for an analysis. What is the error (both absolute and percent) for the average titration volume?