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# Calculate the concentrations of hydrogen ion and hydroxide ion

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Calculate the concentrations of hydrogen ion and hydroxide ion at 25 degrees C.

1. Aniline, C6H5NH2, is used in the manufacturing of some perfumes. What are the values for a 0.035 M solution?
Kb= 4.2 x 10-10

[H+]=

[HO-]=

2. For a solution in which 10.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH

[H+]=

[HO-]=

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#### Solution Preview

To solve your first question, you have to recognize it is a weak acid/base type problem. Aniline has a Kb value, which means it is a weak base.

For these types of questions, there is a simple formula that you must familiarize yourself with.

Kb = x^2 /C-x ( and the -x in the denominator is almost always assumed to not be ...

#### Solution Summary

This solution answers two general chemistry questions that calculate the concentrations of hydrogen ion and hydroxide ion at 25 degrees C.

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