Question

what will be the ph of the solution is zero point zero one mole of hcl is dissolved in a buffer solution containing zero point zero to propanoic acid k e equal to one point three four into ten to the power minus five and zero point zero one five two moles of salt at twenty five degree celsius

Answer 1

Answer on Question #79924 - Chemistry - Physical Chemistry

Question:

what will be the ph of the solution is zero point zero one mole of hcl is dissolved in a buffer solution containing zero point zero to propanoic acid k e equal to one point three four into ten to the power minus five and zero point zero one five two moles of salt at twenty five degree celsius

Solution:

$$pKa = 1.34 * 10^{-5}$$ $$c(\text{salt}) = 0.0152 \, \text{M};$$ $$c(\text{HCl}) = 0.01 \, \text{M};$$ $$[H^+] = c(\text{salt}) * pKa = 0.00045 \, \text{M};$$ $$[H^+]\text{total} = 0.00045 + 0.01 = 0.01045;$$ $$pH = -\lg[H^+] = 1.98.$$

Answer: 1.98.

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