(1) Boric acid sample (H3BO3) contains boron (Na2B4O7.10H2O) as impurity. The quantity of this sample was...

(1) Boric acid sample (H3BO3) contains boron (Na2B4O7.10H2O) as impurity. The quantity of this sample was dissolved in distilled water to give 1 liter of A solution.

(a) 25.00 cm3 of solution A required 8.80 cm3 of 0.01M HCl solution for neutralizing, using methyl red as indicator.

(b) In another 25.00 cm3 of A was added 8.80 cm3 of the 0.01M HCl solution, and some cm3 of glycerol was added. The result is a uniform colorless solution. The final solution was found to be equivalent to 27.30 cm3 of 0.1M NaOH solution, using phenolphthalein indicator. Find the purity of boric acid.

this was the exersice without any other information

Solutions

Expert Solution

queen_honey_blossom answered 4 months ago

Next > < Previous

Related Solutions

A sample of a compound containing boron (B) and hydrogen (H) contains 1.152 g of B...

A sample of a compound containing boron (B) and hydrogen (H) contains 1.152 g of B and 0.3222 g of H. The molar mass of the compound is about 30 g. What is its molecular formula?

crystallization problem: A sample contains 132 mg of compound A along with 24.0 mg of impurity...

crystallization problem: A sample contains 132 mg of compound A along with 24.0 mg of impurity B. The solubility of compound A in water at 25 oC is 14.0 mg/ml, and at 100 oC is 110 mg/ml. The impurity B has the same solubility behavior as compound A in water. a.)How many steps of crystallization you needed to do to get pure compound A? b.)What is the amount of pure compound A after all crystallization steps?

The pH of a 0.77M solution of boric acid H3BO3 is measured to be 4.68. Calculate...

The pH of a 0.77M solution of boric acid H3BO3 is measured to be 4.68. Calculate the acid dissociation constant Ka of boric acid. Be sure your answer has the correct number of significant digits.

An exhaust stream contains 1250 ppm of a toxic impurity that is to be removed by...

An exhaust stream contains 1250 ppm of a toxic impurity that is to be removed by adsorption into a clean liquid; the absorber vent must contain no more than 15 ppm of the impurity. The Henry’s law constant is 0.5. a. If the gas rate is 7.40 kmol/h, how many theoretical stages are required, and what liquid rate is required, if the absorber operates at 1.35 times the minimum liquid rate? b. If the gas rate increases to 8.10 kmol/h...

1. a.) Would boric acid, B(OH)3, be more soluble in ethanol (C2H5OH) or in benzene (C6H6)?...

1. a.) Would boric acid, B(OH)3, be more soluble in ethanol (C2H5OH) or in benzene (C6H6)? Explain your answer. b.) Which of the following ions in each pair would be expected to have the greater energy of hydration? Explain each choice. Mg+2 or Al3+ F-1 or Cl-1 c). Consider the three ionic compounds, NaCl, KCl, and LiCl. Which compound would you expect to have the greatest lattice energy? Why? Which compound would have the greatest energy of hydration? Why? Are...

Tetraboric acid, H2B4O7, is prepared by heating boric acid, H3BO3 (a condensation reaction involving water loss)....

Tetraboric acid, H2B4O7, is prepared by heating boric acid, H3BO3 (a condensation reaction involving water loss). If 400.0 mmol H3BO3 are used, what mass (g) of H2O is formed, assuming quantitative stoichiometric conversion? I know the answer is 9.01 but how do you get the condensation reaction?

a) For 50mL of a 0.400M borate buffer at pH 8.5 (boric acid Ka = 5.8x10^-10),...

a) For 50mL of a 0.400M borate buffer at pH 8.5 (boric acid Ka = 5.8x10^-10), Describe how you would make this using sodium borate (NaH2BO3) and 2.50M HCl. b) what is the solution pH after adding 0.100 mL of concentrated HCl to a 20.0 mL portion of this buffer? c) What is the solution pH after adding 10.0 mL of 6.00 M NaOH to a 20.0 mL portion of this original buffer?

7) How many grams of boric acid should be used in compounding the following prescription: (4...

7) How many grams of boric acid should be used in compounding the following prescription: (4 points) Rx Lidocaine HCl 1% (E=0.20) Pilocarpine HCl 0.5 % (E= 0.24) Boric acid qs (E=0.52) Purified water ad 60 mL Make isotonic solution Sig: 1 drop in each eye

A 7.81 g sample of an aqueous solution of nitric acid contains an unknown amount of...

A 7.81 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 23.2 mL of 1.68 M potassium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture?

A 9.15 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of...

A 9.15 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of the acid. If 29.3 mL of 0.506 M sodium hydroxide are required to neutralize the hydroiodic acid, what is the percent by mass of hydroiodic acid in the mixture?

Subjects