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Calculate the following: a. The pH of a 500.0 mL buffer solution containing 0.75 M HCN...

Calculate the following:

a. The pH of a 500.0 mL buffer solution containing 0.75 M HCN (Ka = 6.2 x 10^-10) and 0.55 M NaCN

b. The pH of the above buffer after the addition of 100.0 mL of 1.0 M NaOH.

c. The pH of the buffer if 100.0 mL of 1.0 M HCl was added to the solution in part a.

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Answer #1

a HCN+H₂O Ka CN + H₂O+ PH is calculated by using hasselbalch fquation ! Handeson PH = Pka + log Isalt] acid] PH = pka + [EN]Moles of Naoh added = 1M x 0.1 L = Oolmel. HON + 0.375 -0.1 U 0.275 meles NaOH 0.1 - Ool o CN- 0.275 meles. +0.1 0.375 moles.- I IC LE CN 0.275 -0.1 0.1750 +H+ ool -0.1 meles. HON. 0.375 +0.1 0.475 . LEN-] = 0.175 meles 0.6L = 0.175M 0.6 [HENI = - 0.

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