A titration involves adding a reactant of known quantity to a solution of an ano
ID: 1054068 • Letter: A
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