Calculate the number of moles of HCl(g) that must be added to 1.0 L of 0.80 M Na

Question

Calculate the number of moles of HCl(g) that must be added to 1.0 L of 0.80 M NaC_2H_3O_2 to produce a solution buffered at pH = pK_a. K_a(CH_3CO_2H) = 1.8 Times 10^-5 Number of moles Calculate the number of moles of HCl(g) that must be added to 1.0 L of 0.80 M NaC_2H_3O_2 to produce a solution buffered at pH - 4.20. K_a(CH_3CO_2H) = 1.8 Times 10^-5 Calculate the number of moles of HCl(g) that must be added to 1.0 L of 0.80 M NaC_2H_3O_2 to produce a solution buffered at pH = 5.00. K_a(CH_3CO_2H) = 1.8 Times 10^-5 Number of moles - moles

Explanation / Answer

Calculate the number of moles of hcl that must be added to 1 l of 0.80 M NaC2H3O2

(a) pH = pKa

HCl + NaC2H3O2 C2H4O2 + NaCl

Ka = [H+] [conjugate base] / [acid]

Ka = [H+] [salt] / [acid]

[CH3COOH] = [CH3 COO-].

So 0.4 mole of HCl is required. -answer

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