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Final pH of NaOH and HA when mixed

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What is the final pH at 25oC when 93.0 mL of 0.133 mol/L NaOH(aq) and 50.0 mL of 0.193 mol/L HA(aq) are mixed. Assume that HA is a weak monoprotic acid with pKa=5.31 at 25C.

Give your answer accurate to two decimal places.

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Solution Summary

In this exercise, students are asked to calculate the final pH when an unequal number of moles of a strong base NaOH and a weak acid HA are mixed, with the pKa of the weak acid given

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What is the Final pH of NaOH and HA when mixed together?

What is the final pH at 25oC when 93.0 mL of 0.133 mol/L NaOH(aq) and 50.0 mL of 0.193 mol/L HA(aq) are mixed. Assume that HA is a weak monoprotic acid with pKa=5.31 at 25C.

Give your answer accurate to two decimal places.

Solution:

NaOH + HA  H2O + NaA

Moles of NaOH = 0.0930 L × 0.133 mol/L = 0.012369 mol
Moles of HA = 0.0500 L × 0.193 mol/L = 0.00965 mol

Moles of NaA produced ...

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