Your lab-mate observes a large amount of streaking and blurring of their samples when they visualize the TLC plate under UV light. What are two possible solutions to this problem?
Q: A. Provide an example of a boiling point composition curve and explain in simple words. Five sentenc...
A: In liquids, the interaction among the constituent particles is much weaker than the interaction in t...
Q: How many liters of a 3.70 M K2SO4 solution are needed to provide 91.8g of K2SO4 (molar mass 174.01...
A: Definition: Molarity is a concentration term for a solution. The molarity of a given solution is def...
Q: If it takes 0.552 L of 0.6 M NAOH to neutralize 1.1 L of an HCl solution, what is the concentration ...
A: Sodium hydroxide reacts with hydrochloric acid, to form sodium chloride and water. The equation for ...
Q: A chemist adds 0.45 L of a 2.9 × 10 M copper(II) fluoride (CuF,) solution to a reaction flask. Calcu...
A:
Q: How much volume (in L) of copper (I) oxide which has a molar concentration of 0.085M, are required t...
A:
Q: common name f
A:
Q: A chemical reaction has the equation 2AgNOg (aq) + Zn (s) -› 2Ag (s) + Zn(NOg)2 (aq). What type of r...
A:
Q: For a spherical cell, as the surface area increases, the volume increases: not at all. at the same r...
A:
Q: nuclear equation
A:
Q: Part B: Draw the structures for the following names: 4-cyclopropyl-2-methyl-3-nitrohept-6-yne-1-ol 4...
A: Since you have posted a question with sub-parts , we are entitled to answer the first three sub-par...
Q: What element is oxidized in the following chemical reaction? NiO2 + Cd + 2H2O → Ni(OH)2 + Cd(OH)2
A:
Q: At what potential should the cyclical sweep begin? open circuit potential anodic peak potential mean...
A:
Q: if you add acid or base to water, how will the pH change?
A: The change in PH when acid or base is added to water is given below
Q: f 145 mL of a 0.0078 mol/L solution of CuNO3 was mixed with 195 mL of a 1.48 x 10-3 mol/L solution o...
A: Solution -
Q: BeF, Molecule ЕPG Hyb (circle if polar) 2D Lewis Structure 3D Lewis Structure MG BC13
A: The complete table for the Lewis structures, EPG, MG, BA and hybridization is shown in the next step...
Q: A chromatographic analysis is performed with a sample containing toluene and benzene. The column len...
A:
Q: A student needs to prepare a buffer solution with a pH of 4.65. Assuming a pKa of 4.57, how many mL ...
A: Given: pH of buffer = 4.65 pKa of acid = 4.57 Concentration of HB = 0.1 M Volume of HB solution = ...
Q: 1) Predict the products of the following reactions (hint: in each reaction, LDA reacts with all of t...
A: In these given reactions, mentioned bases play crucial role for formation of the most stabilised int...
Q: if you add acid or base to a buffer, how will the pH change?
A: Buffer solution : Buffer solution is aqueous solution of mixture of weak acid and its conjugate bas...
Q: A student needs to prepare a buffer solution with a pH of 4.18. Assuming a pKa of 4.69, how many mL ...
A:
Q: A 12.62 g sample of a compound containing only C, H and O produces 27.73 g CO2 and 9.09 g H2O in a c...
A:
Q: uestion 6 What is the pH of a 500 mL buffer containing 0.200 moles NH3 and 0.350 moles NH4CI? Kb = 1...
A:
Q: А. В. С. нн Lo-CH2 CH2 CH3 H OHH2 но— с-он H H H2 SH H H fo B.
A:
Q: 3. Devise a separation scheme similar to the scheme in Figure 4.2. for the following four compounds....
A: The functional groups of a molecule are the key components and it is used to provide the notable che...
Q: Which of the following is not totally dissociated when mixed with water? HC1 а. d. HF b. НBr е. HNO;...
A: The acid which is not totally dissociated when mix with water is given below.
Q: Answer the following questions. _____1. Which of the ff you can use for mixing liquids? a) test tube...
A: 1) The tool which is used for mixing liquids is stirring rod. Therefore, the correct answer is optio...
Q: А. H3C – C = 0-Ĉ – CH2CH3+ CH3CH2CH2-0° В. НаС — С - N - СНз + CI" H
A:
Q: Consider the simple reaction S P, with the forward rate characterized by a rate constant k1, the re...
A:
Q: Consider the reaction in the box. Which of the following is a key intermediate in the mechanism of t...
A: Name of CH3CH2OH is ethanol that contains an alcohol functional group. The given reactant has a he...
Q: explain how serine is capable of hydrogen bonding but it could also form covalent bonds?
A: 1. Hydrogen bond forms between hydrogen atom attached with highly electronegative element (N, O) and...
Q: On acidity and basicity of aqueous solutions, the following relationships are valid, except O If pH ...
A: Option a is correct. Rest all options are valid
Q: Which electron configuration is correct for the selenide ion, Se² ? P[Ne] 3s? 3p? D 1s2 2s? 2p6 3s2 ...
A:
Q: Professor Modyn owns another piston-cylinder device, which initially (State 1) contains 0.236 m³ of ...
A:
Q: 1. An isothermal process is performed on 10 moles of an ideal gas. The gas temperature is 400 K. The...
A:
Q: What is the approximate pH of a solution X that gives the following responses with the indicators sh...
A: The indicators with responses of solution X is given as,
Q: Draw the 2D and the 3D Lewis structure for each molecule. You do not need to show resonance structur...
A: If there if absence of lone pair on central atom, electron pair geometry and molecular geometry are ...
Q: If you were to compare the composition of the air you inhale and the air you exhale, what difference...
A: The process where we inhale and exhale the air is called respiration. There is some compositional ch...
Q: tetraammineplatinum(II) hexachloroplatinate(IV)
A: Given coordination compounds respective structures are written below
Q: The rate constant for this zero‑order reaction is 0.0300 M·s−1 at 300 ∘C. A⟶products How long (i...
A: Given: The rate constant = 0.0300 M s-1 The initial concentration = 0.760 M The final concentration...
Q: Methane, CH4, can be used as a fuel instead of gasoline. If you used 655 g of CH4 in placed of one g...
A: Given, Methane, CH4, can be used as a fuel instead of gasoline. If you used 655 g of CH4 in placed o...
Q: Careful measurements of the potential of the cell Pt|H2(g.pe)|NaOH(aq,0.0100 mol kg-4),NaCl(aq, 0.01...
A:
Q: What mass of solid La(IO,); (663.6 g/mol) is formed when 50.0 mL of 0.250 M La+ is mixed with 75.0mL...
A: Given : Molarity of La3+ = 0.250M Volume = 50ml
Q: A supporting electrolyte is usually added to the analyte solution to O increase the scan rate. O mak...
A: Supporting electrolyte is an electrolyte which contains chemical species that are not electroactive....
Q: A 7.2g sample of potassium chloride is dissolved in 100g of water at 65*C. The solution is cooled to...
A: Solubility Vs Temperature graph of different salts
Q: Consider the following specific heats of metals. Metal Speci...
A: We have to find out the element from the table increase the temperature of the water the greatest am...
Q: Question 5 Where does the redox reaction of interest occur? O At the working electrode. O In the pot...
A:
Q: What are the IUPAC names of the following?
A:
Q: OH OH ОН OH НО HO HỌ. HO ОН Но ОН OH OH ОН
A: The compound which conating free -OH at the alpha position of -O- group is reducing sugar
Q: solution is prepared by dissolving 40.00 g of NaCl (f.w. = 58.44 g mol–1), a non-volatile solute, in...
A:
Q: Calculate [H*], [CIO,], and [OH¯]in an aqueous solution that is 0.165 M in HC1O,(aq) at 25 °C.
A: HClO4 is a strong acid .which shows college dissociation. Concentration of HClO4 and Hydrogen ion an...
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- Although TLC is qualitative and tells you what is present in a given sample, it can also be used to determine where a compound might be lost: What samples could you test on a single TLC plate that might give you this information?PRE-LAB QUESTIONS 1. Why do we set the spectrophotometer or colorimeter to a wavelength of 565 nm or "green" in order to measure the absorbance of crystal violet?Here is the protocol for a UV-Vis spectrophotometer to detect water and chlorine-carbon. 1.Dissolve the water and chlorine-carbon compounds in a solvent, such as water. 2.Prepare a standard solution of known concentration that is similar to the sample being measured. 3.Calibrate the spectrophotometer using the standard solution. 4.Measure the absorbance of the sample using the spectrophotometer. 5.Calculate the concentration of the compounds in the sample using the calibration curve obtained from the standard solution. How is the spectrophotometer calibrated with standard solutions? When is the blank solution placed in the spectrophotmeter?
- Concentrated sulfuric acid, H2SO4, was used to visualize the sugars (cellobiose and glucose), whose identities were confirmed by TLC. Describe the mechanism by which the sulfuric acid, H2SO4, produces visible spots where sugars are present on the TLC plateWhat types of samples can be analyzed by IR?How are substances that are opaque (nottransparent) handled using this technique?2. In UV and visible spectrophotometry, the specimen is generally dissolved in a solvent, and determinations are made at room temperature using a path length of 1 cm. Give the most common solvents suitable for UV or visible spectrophotometry.
- During TLC, what is the stationary phase and what is the mobile phase?Explain why TLC cannot be used for some volatile low molecular weight substances such as toluene.TLC relies on differences in non-covalent forces. Explain the role of these non-covalent interactions in determining the Rf value obtained.
- A student performs a TLC experiment and at the end of the experiment, sees no spots other than the initial spot. What does this mean, and what should the student do to fix the problem?A student does a TLC experiment on a silica gel plate using a purple dye combination and acetone as the solvent. For the blue spot, she gets a R of 0.69 and for the red spot, she gets a R of 0.45. Describe the significance of hA student does a TLC experiment on a silica gel plate using a purple dye combination and acetone as the solvent. For the blue spot, she gets a R of 0.69 and for the red spot, she gets a R of 0.45. Describe the significance of her data.er data.The concentration of methylene blue in the sample is estimated through (select the correct) options: refractive index measurement (refractometry). turbidity measurement (turbidimetry). absorbance measurement (spectrophotometry). titration with 2% HCl solution.