Question
Asked Dec 7, 2019
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Ka for weak acid HZ is 2.8 * 10^-5. The PH of a buffer prepared by combining 50.0 ml of 1.00 M NaZ and 22.0 ml 1.00 M HZ is

A)4.19

B) 4.55

C) 4.91

D) 5.14

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Expert Answer

Step 1

Calculation for number of moles of HZ:

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number of moles molarity = Volume number of moles = molarity x Volume number of moles = 1.0 mol/L × 22.0 × 10-³L number of moles = 0.022 moles

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Step 2

Calculation for number of moles of NaZ:

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number of moles = molarity × Volume number of moles = 1.0 mol/L × 50.0 × 10-³L number of moles = 0.05 moles

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Step 3

Calculation concentration of HZ left after mixing with NaZ:

Number...

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number of moles molarity = total volume of mixture 0.028 mol molarity = 0.07 L molarity = 0.4 M

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Chemistry

Equilibrium Concepts

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