A 0.1504-g sample of impure Na₂CO₃ (106.00g/mol) was analyzed via Volhard method. After adding 50.0 mL of 0.07106 M AgNO₃, the sample was back-titrated with 0.06485 M KSCN requiring 11.69 mL to reach the end point. What is the purity of the Na₂CO₃ sample?    CHOICES: 98.5% 95.7% 89.0% None of these

Q: A student weighs out 0.9854 g of Na2CO3 unknown and dissolves it in 25.00 mL of deionized water. A…

A: Answer % of Na2CO3 in the unknown = 54.05% Formulas No.of moles                           = Given…

Q: The amount of CaCO3 in an antacid tablet was determined by back titration. An excess of HCl (50mls…

A: Let us first calculate the moles of HCl and NaOH,         moles of HCl =Molarity of HCl x  Volume of…

Q: A 250.0-mg sample of an organic weak acid was dissolved in an appropriate solvent and titrated with…

A: Assuming the equivalent weight of acid is E. Given : mass of acid = 250 mg = 0.25 g…

Q: A 0.6423 g sample that might contain NaOH, Na₂CO₃, NaHCO₃, or a permissible mixture of the bases is…

A: NaOH is a strong acid, so first it will be completely neutralised by the strong acid HCl. The…

Q: A 1.200-g sample of a mixture of NaOH (FW 40.00 g/mol) and NayCO3 (FW 105.99 g/mol) with inert…

A: The reaction between acid and base is termed as neutralization reaction. The products are salt and…

Q: Use a primary standard to determine an unknown concentration using an acid-base titration. Potassium…

A: When KHP and barium hydroxide react with each other,then Following balanced Chemical Reaction…

Q: What is the molar concentration of a dilute HCI solution if the addition of 10.89 mL of the acid to…

A: Answer:In this given titration, concentration is being found out using Na2CO3. In the first step…

Q: A 1.0 g sample containing urea was dissolved in water and diluted in a 100.00 mL volumetric flask.…

A: On reaction with sulphuric acid, urea produces ammonia. One mole of urea produces one mole of urea.…

Q: A 1.0 g sample containing urea was dissolved in water and diluted in a 100.00 mL volumetric flask.…

A: When Urea  reacts with sulphuric acid then ammonia is produced.  Now this ammonia is treated with…

Q: Compare the two quantities based on the given condition: A solution containing KOH and KHCO3 is…

A: Here we have to predict the correct statement when double indicator titration is used for mixture…

Q: A 100 mL sample contains Na2CO3 and NaOH. A 25 mL aliquot was taken and phenolphthalein was added as…

A: (1) Step 1 phenophthalein is used as an indicator. (2) Step 2 methyl orange is used as an indicator.

Q: A 1.876 g of the sample containing H2C2O4 requires 38.84 mL of 0.1032 M of NaOH for titration:…

A: Answer: This question is based on acid-base titration where acid is the analyte and base is the…

Q: An AgNO3 solution was prepared by dissolving 5.25 g of pure AgNO3 (169.87g/mol) in sufficient water…

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Q: Draw the shape of a pH curve for the titration of 400 mL of 1.0 M H2SO3 with 0.5 M NaOH. What type…

A: The titration curve for the titration of 400 mL of 1.0 M H2SO3 with 0.5 M NaOH solution is needed to…

Q: 10.00mL of O.10M HCI were collected in an Erlenmeyer flask, and 100mL with distilled water. After…

A: HCl is an acid and NaOH is a base and both react to form salt and water. The H+ ions dissociated…

Q: 1.876 g of the sample containing H2C2O4requires 38.84 mL of 0.1032 M of NaOH for titration: H2C2O4+…

A: Given that -  Mass of sample containing H2C2O4 = 1.876 g  Volume of NaOH = 38.84 mL  Molarity of…

Q: What is the percentage of NaOH in the sample?

A:

Q: 27. A 0.2564-g sample of primary standard potassium hydrogen phthalate (204.23 g/mol) was titrated…

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Q: IO3– + 8I– + 6H+ ⇌ 3I3– + 3H2O. The 50-mL of I3 or triiodide (0.0014 mol) was used to standardize…

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Q: What volume of a 0.0225 solution of potassium permanganate are required to titration 0.461 g sample…

A: The concentration of potassium permanganate (KMnO4), M = 0.0225 M Given mass of sodium oxalate…

Q: A 1.0 g sample was analyzed by - Kjeldah method, the produced NH3 was distilled into 45.0 mL of 0.2…

A: Kjeldahl Method consists of three processes:-1: Digestion - sample is heated in the presence of…

Q: A 25.00ml sample of an H2SO4 solution of unknown concentration is titrated witha 0.1322 M KOH…

A: The neutralisation reaction taking place is  2 KOH (aq) + H2SO4 ------> 2 H2O (l) + K2SO4…

Q: A 25.0 mL sample of 0.250 M nitrous acid is titrated with a 0.250 M NaOH solution. What is the pH at…

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Q: Argentometric titration of a 0.7908-g sample containing chloride ion required 45.32  mL of 0.1046 M…

A:

Q: A 250.0-mg sample of an organic monoprotic weak acid was dissolved in an appropriate solvent and…

A: Ratio of number of gram equivalents present in the solution to the volume of the solution in liter…

Q: A 100 mL sample contains Na2CO3 and NaOH. A 25 mL aliquot was taken and phenolphthalein was added as…

A: Phenolphthalein can only detect the neutralization of NaOH and Na2CO3 to NaHCO3.  The balanced…

Q: 6. A student who wants to make chloride determination by Volbard method; a) To adjust the KSCN…

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

Q: A 0.500 g of sample containing Na2CO3 and inert matter is analysed by adding a slight excess of 50.0…

A: According to the mole concept, in terms of mass, the amount of substance in moles is equal to the…

Q: A 0.2564-g sample of primary standard potassium hydrogen phthalate (204.23 g/mol) was titrated with…

A: Given information: Mass of sample = 0.2564 g Volume of HCl = 11.47 mL Volume of NaOH = 1.42 mL…

Q: Which of the following indicators is best suited to determine the equivalence point of a titration…

A: According to the question, we have titration curve of ammonium chloride and strong base.  We need to…

Q: A 0.2001 g sample of Na2CO3 required 25.10 mL of excess HCl to reach endpoint. The excess HCl was…

A:

Q: A 1.0 g sample containing urea was dissolved in water and diluted in a 100.00 mL volumetric flask.…

A: Given information, Mass of sample = 1.0 g Molarity/Concentration of HCl = 0.0500 M  Volume of HCl =…

Q: A 0.4263 g solid sample containing NaCl and KBr only was dissolved in 50 mL of water and titrated to…

A: