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.

Q: A chemistry student must write down in her lab notebook the concentration of a solution of sodium…

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Q: When answering this problem, report the answer with the appropriate number of significant figures.…

A: We have to calculate the concentration of iodide ion.

Q: Calculating ion molarity using solute mass A chemist prepares a solution of magnesium bromide…

A: For MgBr2 solution , the molarity of Mg2+ is same with MgBr2 and  Br- will be double than the…

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A: The question is based on the concept of titrations.   we are titrating  a strong Sulphuric acid with…

Q: A 11.00 gram sample of Vodka was analysed for its alcohol content. The sample was placed in a300 mL…

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A: Acetic acid reacts with sodium hydroxide to form sodium acetate and water. The equation for the…

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

A: STANDARDIZATION is used for knowing  exact concentration of titrant that we are using for accurate…

Q: You perform your first titration using your NaOH with a KHP solution. Your KHP solution is made with…

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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: 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: To measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a…

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Q: Calculate the eq per liter of 0.321g Na2CO3Na2CO3 when it is mixed in a 250ml solution. (MM Na2CO3=…

A: The normality of a solution is an important method which is used to indicate the concentration of a…

Q: You have a method that requires you to make a solution of disodium hydrogen phosphate (Na2HPO4). It…

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

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Q: If 0.42 mg calcium fluoride, CaF2 is used as above to add fuoride to the drinking water, does CaFz…

A: Given that 0.42 mg CaF2 is used to add fluoride in drinking water.We have to find between 0.42 mg of…

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

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

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Q: When answering this problem, report the answer with the appropriate number of significant figures.…

A: Give that the solution is prepared by mixing KI(aq), Na2S2O3(aq), water, KBrO3(aq) and HCl(aq). Here…

Q: A chemistry student must write down in her lab notebook the concentration of a solution of sodium…

A: Given: Mass of cylinder = 4.0 g.Mass of cylinder with thiosulfate = 46.56 g.And the volume of the…

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

A: In Quantitative approach, we measure mass of the sample, volume of the sample and then finally,…

Q: 23.15 grams of sodium cyanide, NaCN, are dissolved in a 500.00 mL volumetric flask which is filled…

A: Given : Mass of NaCN = 23.15 g And volume of solution = 500.00 mL = 0.50000 L…

Q: Write a procedure that a laboratory technician could use to prepare 2.0 L of 0.25 mol/L sulfuric…

A: “Since you have asked multiple question, we will solve the first question for you. If you  want any…

Q: In the laboratory you dessolve 22.3g of iron (III) fluoride in a volumetric flask and add water to a…

A: The number of moles of solute to the volume of solution in liters is known as molarity.

Q: How many moles of solute are present in 300. mL of a 0.60 M solution of NaOH? Please report your…

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Q: If 0.42 mg calcium fluoride, CaF2 is used as above to add fuoride to the drinking water, does CaFz…

A: Given that , Volume of water = 250 mL  Weight of CaF2 and NaF are same i.e.0.42mg = 0.00042 g…

Q: A chemistry student weighs out 0.146 g of lactic acid (HC,H,O,) into a 250. mL volumetric flask and…

A: Mass of lactic acid = 0.146 gMolar mass of lactic acid = 90 g/molMoles of lactic acid = Mass of…

Q: Precipitating gravimetry is a technique to determine the amount of an analyte based on mass of the…

A: Precipitating gravimetry is a technique to determine the amount of an analyte based on mass of the…

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: 3.45 mol of LiCl in 3.53 L of solution Express the molarity in moles per liter to three significant…

A: Given  (a)  Number of mole of LiCl = 3.45 mole        Volume = 3.53 Liter        Molarity = ?  (b)…

Q: Sodium hydroxide solution was standardized against one gram of potassium phthalate. First trial used…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: ▾ Part A A 0.5880 g sample of impure magnesium hydroxide is dissolved in 102.0 mL of 0.2044 M HCl…

A: Molarity of HCl = 0.2044 mol/LMolarity of NaOH = 0.1039 mol/LMass of impure sample = 0.5880 gmolar…

Q: A chemist performs a gravimetric analysis. The chemist combines 1.00 L of 2.00 M AGNO, (ag) with…

A: Given: Concentration of AgNO3 = 2M Concentration of NaCl = 4M Volume of AgNO3 = 1 L Volume of NaCl =…

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

A: Concentration in terms of Micromole per litre...

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: 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: A chemistry student must write down in her lab notebook the concentration of a solution of sodium…

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Q: When answering this problem, report the answer with the appropriate number of significant figures.…

A: Given: Volume of sample = 6.5 mL Volume of water added = 50 mL Concentration of NaOH = 0.5824 molar…

Q: 20.0 grams of Sodium hydroxide was dissolved in water up to 500 mL. Calculate the Normality of the…

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Q: When answering this problem, report the answer with the appropriate number of significant figures.…

A: Balanced reaction between H2SO4 and NaOH is: Calculation of no. of moles of NaOH:

Q: On their third titration trial, the CHM 111 student used 18.80 mL of 0.205 M NaOH(aq) to neutralize…

A: Balanced Reaction HCl (aq) + NaOH (aq) ---> H2 O (l) + NaCl(aq)  Volume of NaOH = 18.80 mL…

Q: A TUMS tablet was dissolved in 110.00 mL of 0.1022 M HCl and analyzed for CaCO3 according to the…

A: The reaction of acid HCl with CaCO3 is given below,CaCO3 + 2HCl → CaCl2 + CO2 + H2OThe reaction of…