(c) 1/Ka (d) Kw/Kb if you had to choose between 0.1O M IIC2 11,0, (Ka 1.8 12 x i
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Question
(c) 1/Ka (d) Kw/Kb if you had to choose between 0.1O M IIC2 11,0, (Ka 1.8 12 x io-s) and 0.10 M I ICI 102 (K,-1.8 × 10-4), which would have the lower pH? or k (b) HCHO2 (d) it would depend on (c) both would be the same the volume 7 A certain buffer contains equal concentrations of X-and IIX, The Ka of HX is 10-10. The pH of the buffer is Wx- ry (a) 4 (c) 10 (b) 7 (d) 14 18. A buffer is formed by adding 500 cm3 of 0.20 M HC2 H,02 to 500 cm3 of 0.10 M NaC2 H3 O2. What is the maximum amount of HCl that can be added to this solution without exceeding the capacity of the buffer? (a) 0.01 mol (c) 0.10 mol (b) 0.05 mol (d) 0.20 mol TUSED How to 2
Explanation / Answer
16)
concentration of both the acid is same but Ka is different
The one with greater value of Ka will be stronger acid and its pH will be lower
Ka is larger for HCHO2. So, this will have lower pH
Answer: b
17)
Ka = 1*10^-10
pKa = - log (Ka)
= - log(1*10^-10)
= 10
use:
pH = pKa + log {[conjugate base]/[acid]}
pH = pKa + log {[X-]/[HX]}
= 10+ log {1/1}
= 10
Answer: c
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