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A buffer solution contains 0.350 M NaHSO3 and 0.387 M Na2SO3. Determine the pH change when...

A buffer solution contains 0.350 M NaHSO3 and 0.387 M Na2SO3. Determine the pH change when 0.104 mol HNO3 is added to 1.00 L of the buffer.

pH change =

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Expert Solution

Calculation of initial pH of buffer solution.

We have Henderson's equation, pH = pKa + log [ Salt ]/ [ Acid]

pH = pKa + log [ Na₂SO₃ ] / [ NaHSO₃ ]

pH = 7.172 + log 0.387 / 0.350

pH = 7.172 + 0.04364

pH = 7.2156

pH = 7.216

Calculation of pH of buffer solution after addition of HNO ₃ .

Consider reaction of HNO ₃ with buffer solution.

Na₂SO₃+ HNO ₃ NaHSO₃ + NaNO ₃

Let's use ICE table.

M	Na₂SO₃+ HNO ₃ NaHSO₃
I	0.387	0.104	0.350
C	- 0.104	-0.104	+0.104
E	0.283	0.000	0.454

We have equation , pH = pKa + log [ Na₂SO₃ ] / [ NaHSO₃ ]

pH = 7.172 + log ( 0.283 / 0. 454 )

pH = 7.172 - 0.2053

pH = 6.9667

pH =6.967

pH Change = pH of buffer solution after addition of nitric acid - initial pH of buffer solution.

pH change = 6.967 - 7.216

pH change = - 0.249

ANSWER : - 0.249

queen_honey_blossom answered 1 year ago

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