Identify and explain the mistakes made in the following laboratory protocols:  A 1250 mg sample of NaOH was weighed using an analytical balance. The pellets were directly transferred in the balance pans, pellets were gradually added until the reading of the balance was near to 0.2000 mg.

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A: Mass of the gold sample taken for analysis = 11.2456 g  11.2456 g is diluted to 200.00 mL to form…

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Q: The toxicity of DDT (C14H9CI5) led to a ban on its use in the United States in 1972. Determinations…

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Q: What mass of the CuCl₂·2H₂O (170.48 g/mol) should be weighed in order to prepare the 250.0 mL Cu(II)…

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Q: A reaction is made up in the following way: 12 mL of 4.7 M acetone + 19 mL of 1.8 M HCI + 19 mL of…

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Q: Gravimetric Analysis of Calcium Carbonate and Hard Water Introduction In this laboratory activity,…

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Q: What are the pertinent chemical equations in the standardization of sodium thiosulfate solution?

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A: Given: Mass of soap sample burned = 3.130 mg. Concentration of NaOH used = 0.01530 M And volume of…

Q: What type of chemical analysis would you use for the following?  1. 500 milligrams of ascorbic acid…

A: Chemical analysis is the study of separation and determination of various components of a sample.…

Q: A reaction is made up in the following way: 12 ml of 4.1 M acetone + 19 mL of 1.2 M HCI + 19 ml of…

A: Given: The total volume of the solution, (V1) =( 12 + 19 + 19 + 17 ) mL. The concentration of I2…

Q: A reaction is made up in the following way: 19 mL of 4.2 M acetone + 11 mL of 1.1 M HCI + 18 mL of…

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Q: Most analytical machines used in science can either measure absorbance of light, like the…

A: Given: mg/L NO3- Absorbance 0 0 0.1 0.183 0.3 0.542 0.5 0.914 0.7 1.298 1 1.61

Q: How many grams of NaCl are required to precipitate most of the Ag+ ions from 1.50 × 10² mL of 0.0547…

A: First we need to write a balanced chemical reaction and then we have to find moles of AgNO3 . From…

Q: 1. How would each of the following procedural errors affect the value obtained for the molar volume…

A: Answer: When a metal reacts with acid, it produces H2 gas and metal salts. For example: Na+HCl= Nacl…

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Q: Write a procedure explaining how to prepare a solution with a 3.45 % by weight of solid compound…

A: 3.45% by weight means 3.45 g of solute in 100 g solution. so in 100 g mass of solute is 3.45 g and…

Q: The concentration of a NaOH solution was determined in a single experiment by titrating a weighed…

A: Weight KHP + container (final) = 10.8364±0.0001 g Weight KHP + container (initial) = 11.6723 ±0.0001…

Q: The sample contains CaCl2 and its concentration was 0.03M. Calculate grams of CaCl2 present in 100…

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Q: A 30 mL sample of vinegar is titrated with 39 mL of 0.5 N Sodium Hydroxide. What is the normality of…

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Q: By pipet, 10.00 mL  of a 0.823 M stock solution of potassium permanganate (KMnO4) was transferred to…

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Q: Calculate the normality of 12.5 g of potassium permanganate (KMnO4) in 475 mL solution

A: The number, n = 5 for KMnO4 as it accepts 5 electrons to become Mn2+

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Q: QUESTION 4 Calculate the mass of CH3COOH in vinegar in grams (g). Number answer only, do not write…

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Q: 5. Using YOUR data for this experiment calculate your answers and fill in the following table. (Show…

A: Average mass- It is the sum of the masses of all the samples divided by the total number of samples.…

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Q: The following steps were used to determine the concentration of acetic acid in vinegar. 1. Sodium…

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Q: e the molarity (M = moles/L) of the NaOH solution to the correct number of significant figures. %3D

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Q: You wish to determine the density of two unknown, immiscible liquids, A and B, at room temperature.…

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Q: Part III. Preparation of 50 mL 0.2M CuSO4 solution Materials: CuSO4-5H₂20, weighting paper, spatula,…

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Q: A solution is prepared by dissolving 4.40 g of KSCN in enough water to make 340. mL of solution.…

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Q: In Analytical Chemistry, we are conducting an Absorbance Lab using CuSO4 . 5H2O . In the lab we are…

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Q: References Use the References to access important values if needed for this question. Potassium…

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Q: What are the qualitative and quantitative approaches to measure densities, respectively? In air, the…

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Q: Which of the following separation techniques is ideal to separate a solute from the solvent of a…

A: Extraction is the answer. In the extraction process the desired product is extracted from the…

Q: A chemist prepares a solution of silver(I) nitrate (AGNO,) by measuring out 245. µmol of silver(I)…

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Q: By pipet, 9.00 mL of a 0.823 M stock solution of potassium permanganate (KMn04) was transferred to a…

A: Given Molarity of KMnO4 stock solution = 0.823 M = M1Volume of KMnO4 stock solution Taken = 9.0 mL =…

Q: When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with…

A: The number of moles of I2 is used to get the endpoint of the titration is determined as follows.…

Q: How many grams of oxalic acid, H2C2O4, are required to prepare 750. mL of a 0.250 M oxalic acid…

A: Molecular Wt of oxaclic acid = 1262 (no. of eq)g To find the grams of 0.25M oxalic acid needed for…

Q: A solution is prepared by pipetting 25.00 mL of 3.0 x 10-4 M CaCl2 into a 750.00 mL volumetric flask…

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Q: Most analytical machines used in science can either measure absorbance of light, like the…

A: Concentration of unknown solution can be determined from the graph of concentration vs. Absorbance.

Q: In the labo E obtains tlhe following data for an aqueous solution of KCI (molar mass = 74.6 g/mol)…

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Q: Part II. Preparation of 50 mL 0.5% NaCl solution Materials: NaCl, weighting boat, spatula, balance,…

A: Given that, You have posted multiple questions, according to guidelines I am solving first one.If…