pipet 1.0mec6. Pour 50 ml of the buffer solution you prepared into a 150 mL beak
ID: 555685 • Letter: P
Question
pipet 1.0mec6. Pour 50 ml of the buffer solution you prepared into a 150 mL beaker and M NaoH (CAUTION: highly concentrated MaOH) into the beaker. Mix the solution measure the pH. Calculations Calculate the pH values of the prepared buffer solution before and after adding HCI and NaOH. Before addition of acid or base pH=pk. +bg [A1 whereisthe molaron entration ofatooo-andtHAI is the molar concentration of CH3COOH After addition of HCL Calculate the new concentrations of the components of buffer HA H+ (aq) + CH3COO-(aq) CHgCOOH (aq) + H20 (n 0.006 mol Before reaction mol mol 0,006 mol -0.006 mol After reaction HA Afteraddition ofNo0H Calculate the new concentrations of the components of buffer OH' (aq) + CH3COOH (aq)- CH3C00" (aq) + H2O(/) 0.006 mo Before reaction mol mol -0.006 mol-0 After reaction 0 IA [HA]Explanation / Answer
Since no data is given on initial concentrations of CH3COO- and CH3COOH, pH will be controlled by the addition component either strong acid or strong base.
After Addition of HCl,
Moles of H+ = 0.006
[H+] = 0.006 / 51 = 1.17 x 10-4
pH = -log (1.17 x 10-4) = 3.93
After adding NaOH,
[OH-] = 0.006/51 = 1.17 x 10-4
pOH = 3.93
pH = 10.07
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