Part A The graphs labeled () and (l) shew the titration curves for two equal-vol

Question

Part A The graphs labeled () and (l) shew the titration curves for two equal-volume samples of bases, one weak and one strong. Both titrations were carried out with the same concentration of strong acid. What is the approximate pH at the equivalence point of each curve? Express your answers as integers separated by a comma 14 12 10 12 10 pH.), pH(ii) Submit My Answers Give Up 0 10 20 30 40 50 Volume of acid added (mL) 0 10 20 30 40 0 Volume of acid added (mL) Part B Which curve corresponds to the ttration of the strong base and which one to the weak base? Graph () represents a strong base and graph (i) represents a weak base Graph (i) represents a strong base and graph (0) represents a weak base My Answers Give Up

Explanation / Answer

A)

i) curve

has a pH = 7 approx, since this is strong acid / strong base titration

ii)

this appeasr to be weak base + strong acid

the pH is slightly lower than 7, that is, approx 5

B)

as stated before

strong base --> left side

weak base --> right side due to buffer formation and pH = lower than 7 due to hydrolysis

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