Question

Quantitative Analysisi This important compound is mined in large deposits in Wyoming. In water, Na COs completely dissociates into sodium ions and the dibasic carbonate ion (CO). S. (a) Sodium carbonate, Na CO, is used in processing paper, making glass, and some types of soap. HCO, K,2 = 4.7 x 10-1.) (Possibly useful information: For H;CO;; Ka- 4.5 x107; acting as a base in water: (i) Complete the reaction that shows CO CO+HO Solution: 6. (ii) What is the value for the K, for that reaction? Solution: (ii) What then would be the pH of a 0.010 M solution of Na COs? Solution:

Answer 1

Answer:-

This question is is solved by using the simple concept of hydrolysis of salt of weak acid and strong base, the pH is calculated using Ka value.

The answer is given in the image,

Ansliners cis My Coa, kaj = 4.5X10-7 kay = 4.7x10-11 - C0₂² +420 413 + oH lKb = Kw - 100X1024 Kan 4.7x10-11 1 Kb = 2.13x10-4 " CO327490 = H6037 04 0.010-x x x Kb = CHC0, 2004) 1. [co- 2.13 X10-4 = 2.2 0.010- 2.13x10-6-2.13x10-4x= x2 372 +2.13x10-4-2.13x10- 6=0 2 = -2.13x10-4. Je 13x10-43274x 2.13 X106 x = -2:13X1042.925x10-3 2-1.36 X10-3M 2 (04-) = 1.36x10-3M POU =- log conr) = -log(1.36X10-3) pont: 2.87

рН= 14- роя ея = 14 -2487 ри = 11.13