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# Calculate the pH

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Calculate the pH upon diluting 2ml of 2 N HCL to a final volume of 100 ml?

Calcuate the pH upon addition of 0.0075 mole of solid NaOH to 100 ml of a 0.1 M solution of acetic acid (pKa=4.7)?

If equal molar amounts of Na2HPO4 and NaJpo4 are mixed in water, calcuate the resulting pH. The pKas of phosphoric acid are 2.1, 7.2, 12.4.

Calculate the % dissociation of a 0.1M solution of weak acid(pKa=5.0)?

Which of the following pairs would makw the best buffer at pH10.0?
a. Acetic acid & sodium acetate
b. NaH2PO4 & Na2HPO4
c. H2CO3 & NaHCO3
d. Methylammonium chloride & Methylamine

https://brainmass.com/chemistry/acids-and-bases/calculate-the-ph-47607

#### Solution Preview

Calculate the pH upon diluting 2ml of 2 N HCL to a final volume of 100 ml?

HCl is monoprotic therefore 2 N = 2 M (or mol/L)

Using C1V1 = C2V2 (2 M)(2 mL) = C2 (100 mL)

And C2 = 0.04 M therefore pH = -log (0.04)

pH = 1.4

Calcuate the pH upon addition of 0.0075 mole of solid NaOH to 100 ml of a 0.1 M solution of acetic acid (pKa=4.7)?

Using the fact that acetic acid will completely react with NaOH to produce ...

#### Solution Summary

This solution involves calculating pH upon dilution and addiction and the % dissociation of an acid solution.

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