uestion Completion Status: QUESTION 4 Calculate the pt of a solution that resuit
ID: 1026321 • Letter: U
Question
uestion Completion Status: QUESTION 4 Calculate the pt of a solution that resuits tom moxing 29 mnL f 0 12MHBoona) with 39 m at 13 MNBla) The K alue tor H x QUESTION 5 A buffer consists of 0.36 M H2CO3 and 0 24 M KHCo3 Gven that the K values for HbCo3 ae, Kg 45 x 10-7 and Ka2 47x 10-11, calculate the pt for this bufter QUESTION A bulfer that contains 0.11 M of an acid, HA and 0 29 M of ts conjugate base A has a ph of 4 56. What is the pH atter 0.015 mol of NaOtHt are added to 0 62 L of the soution? QUESTION 7 Calculate the pht during the titration of 20 0 mL of 0 25 M HBr with 0 25 M KOH alter 20 1 ml of the base have been added QUESTION 8
Explanation / Answer
4)
Concentration after mixing = mol of component / (total volume)
M(NaBrO) after mixing = M(NaBrO)*V(NaBrO)/(total volume)
M(NaBrO) after mixing = 0.13 M*39.0 mL/(39.0+29.0)mL
M(NaBrO) after mixing = 7.456*10^-2 M
Concentration after mixing = mol of component / (total volume)
M(HBrO) after mixing = M(HBrO)*V(HBrO)/(total volume)
M(HBrO) after mixing = 0.12 M*29.0 mL/(29.0+39.0)mL
M(HBrO) after mixing = 5.118*10^-2 M
Ka = 2*10^-9
pKa = - log (Ka)
= - log(2*10^-9)
= 8.699
use:
pH = pKa + log {[conjugate base]/[acid]}
= 8.699+ log {7.456*10^-2/5.118*10^-2}
= 8.862
Answer: 8.86
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