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Vesnalui [34]
3 years ago
13

Which of the following represents a phase change? A. Melting B. Crushing C. Expanding D. Burning

Chemistry
1 answer:
Fantom [35]3 years ago
6 0
Melting is an example of phase change
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Answer:

The pH is 7.54

Explanation:

The Henderson - Hasselbalch equation states that for a buffer solution which consists of a weak acid and its conjugate base, the buffer pH is given by:

pH =pk_{a} +log(\frac{[conjugate base]}{[weakacid]})

pkₐ is for the acid

In this case, the buffer hypochlorous acid  HClO is a weak acid, and its conjugate base is the hypochlorite anion ClO⁻  is delivered to the solution via sodium hypochlorite NaClO .

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∴pH = =7.54 +log\frac{0.2}{0.2} = 7.54

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