4) (30 pts) What is pH of (show all your work) A) 0.038 M solution of KOH B) 0.0022 M solution of Ca(OH)2 D C) 0.038 M solution of HF D) 0.0022 M solution of H2S E) 000022 M solution of H2S
Solution
Answer -
A-
pOH = -log(OH-) =-log(0.038) = 1.42
We know that,
pH +pOH = 14
pH = 14-1.42 = 12.58
B. 1 mol of Ca(OH)2 produce two moles of OH-
pOH = -log(2*0.0022) = 2.356
pH = 14-2.356 = 11.644
C- HF produce H+ ions in the solution.
pH= -log(H+) = -log( 0.038) = 1.42
D. it gives twom moles of H+ for each mole of H2S
pH = -log(2*0.0022) = 2.356
E. SAme as above-
pH =-log(0.00022*2) = 3.356
.
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4) (30 pts) What is pH of (show all your work) A) 0-038 M solution of.docx
1. 4) (30 pts) What is pH of (show all your work) A) 0.038 M solution of KOH B) 0.0022 M
solution of Ca(OH)2 D C) 0.038 M solution of HF D) 0.0022 M solution of H2S E) 000022 M
solution of H2S
Solution
Answer -
A-
pOH = -log(OH-) =-log(0.038) = 1.42
We know that,
pH +pOH = 14
pH = 14-1.42 = 12.58
B. 1 mol of Ca(OH)2 produce two moles of OH-
pOH = -log(2*0.0022) = 2.356
pH = 14-2.356 = 11.644
C- HF produce H+ ions in the solution.
pH= -log(H+) = -log( 0.038) = 1.42
D. it gives twom moles of H+ for each mole of H2S
pH = -log(2*0.0022) = 2.356
E. SAme as above-
pH =-log(0.00022*2) = 3.356
