Titrations of Diprotic and Polyprotic Acids Video Lessons

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Problem: Consider the acid/base neutralization reaction of strontium hydroxide and phosphoric acid:a. Write a balanced molecular equation for this reaction. Include all phases for both reactants and products.b. If a titration of 61.00 mL of an unknown H3PO4 solution requires the addition of 82.50 mL of 0.300 M Sr(OH)2, what was the original concentration of the phosphoric acid solution?c. At the end of the titration, what is the final concentration of Sr2+ ions?

FREE Expert Solution

Part a.

Recall:

Acids → proton (H+) donor
Bases → proton (H+) acceptor


H3PO4 

• weak triprotic acid
• 3 H+ to donate

H3PO4(aq) ⇌ 3 H+(aq) + PO43-(aq)

Sr(OH)2 

• strong base → will completely dissociate in the solution

Sr(OH)2(aq) → Sr2+(aq) + 2 OH-(aq)

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Problem Details

Consider the acid/base neutralization reaction of strontium hydroxide and phosphoric acid:

a. Write a balanced molecular equation for this reaction. Include all phases for both reactants and products.

b. If a titration of 61.00 mL of an unknown H3PO4 solution requires the addition of 82.50 mL of 0.300 M Sr(OH)2, what was the original concentration of the phosphoric acid solution?

c. At the end of the titration, what is the final concentration of Sr2+ ions?

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