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3 years ago

Why ammonia is a identified as a weak base?

Chemistry

1 answer:

trapecia [35]3 years ago

7 0

Answer:

Ammonia doesn't contain any hydroxide ions to begin, but it's dissolved in water acquires hydrogen ion from the water to produce hydroxide as well as ammonium ions. However ammonia doesn't fully convert into hydroxide and ammonium ions in solution that's why ammonia is a weak base.

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A 420 mL sample of a 0.100 M formate buffer, pH 3.75, is treated with 7 mL of 1.00 M KOH. What is the pH following this addition

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<u>Answer:</u> The pH of the resulting solution will be 3.60

<u>Explanation:</u>

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Molarity of potassium formate = 0.100 M

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$\text{Moles of potassium formate}=(0.100mol/L\times 0.420L)=0.042mol$

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$HCOOH+KOH\rightleftharpoons HCOOK+H_2O$

I: 0.042 0.007 0.042

C: -0.007 -0.007 +0.007

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Given values:

$[HCOOK]=\frac{0.049}{0.427}$

$[HCOOH]=\frac{0.035}{0.427}$

$pK_a=3.75$

Putting values in equation 2, we get:

$pH=3.75-\log \frac{(0.049/0.427)}{(0.035/0.427)}\\\\pH=3.75-0.146\\\\pH=3.60$

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