A titration involves adding a reactant of known quantity to a solution of an ano

Question

A titration involves adding a reactant of known quantity to a solution of an another reactant while monitoring the equilibrium concentrations. This allows one to determine the concentration of the second reactant. A pH titration curve specifically monitors the pH as a function of the titrant. When conducting calculations involving a titration, the first step is to write the balanced chemical equation. Then, use the stoichiometric ratios developed from this equation to determine how many moles of each reagent are reacting. What is the pH of the solution after 50.0 mL of base has been added? Express the pH numerically. What is the pH of the solution at the equivalence point? Express the pH numerically.

Explanation / Answer

HCl                                                                            NaOH

MA   = 0.2M                                                            MB = 0.25M

VA   = 100ml                                                           VB = 50ml

      M     = MAVA-MBVB/VA+VB

            = 0.2*100-0.25*50/100+50

           = 7.5/150 = 0.05M

   M = {H+] = 0.05M

PH = -log[H+]

      = -log0.05

      = 1.3010

HCL + NaOH -------------> NaCl + H2O

at equalent point no of moles of HCL = no of moles of NaOH

at equalent point PH = 7

                               

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