Vitamin C is a monoprotic weak acid, which alto is called ascorbic acid (C_6 H_3

Question

Vitamin C is a monoprotic weak acid, which alto is called ascorbic acid (C_6 H_3 O_6 176 g/mol). A vitamin C tablet weighing 0.75 k was dissolved in 50.0 mL of water and titrated with 0.250 M sodium hydroxide. It took 12.5 ml. of the NaOH solution to reach the end point. What is the percentage of vitamin C in the tablet? Only the vitamin C reacted with the NaOH. One brand of extra-strength antacid tablets contains 750 mg of calcium carbonate (100 g/mol) in each tablet Stomach acid is essentially a hydrochloric acid solution. Is so much caking carbonate really needed to neutralize stomach acid? Calculate the volume of stomach acid with a pH of 1.0 that one of these tablets could neutralize. and compare that value with the normal volume of stomach fluid, which usually is about 100 mL. One tablet can neutralize ___ mL of stomach acid at a pH of 1.0. a. 75 b. 150 c. 250 d. 15 e. 7.5 Calculate the solubility of MgF_2 in water if the K_sp for the compound is 6.4 times 10^-9. a. 2.13 times 10^-9 M b. 1.86 times 10^-3 M c. 1.17 times 10^-3 M d. 1.47 times 10^-3 M e. 3.25 times 10^-5 M Calculate the for Li_3 PO_4 if at equilibrium the concentration of PO_4^3- ion is 3.30 times 10^-3 M. a. 3.2 times 10^-9 b. 3.6 times 10^10 M c. 1.2 times 10^-10 M d. 5.7 times 10^-2 M e. 8.3 times 10^-4 M

Explanation / Answer

Ans 24 - The reaction equation is -

MgF2 ------> Mg2+ + 2F-

let x mole / l of MgF2 be dissolve at equilibrium

this will give x mol / l of Mg 2+ and 2x mole / lit of F-

Ksp = Mg2+ x F-

Ksp = (x) (2x)2

6.4x10-9 = 4x3

x = 1.169 x 10-3M

so , 1.17 x 10-3 M

so option is c

Related Questions

Navigate

• Browse (All)
• Browse V
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.