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3 years ago

To what volume should 5.0 g of KCl be diluted in order to prepare a 0.15 M solution? L

Chemistry

1 answer:

Nesterboy [21]3 years ago

7 0

Answer:0.45L

Explanation:

molarity=0.15M

Mass=5g

No of moles=mass ➗ molecular mass

Molecular mass of KCL=39.0983x1+35.453x1

Molecular mass of KCL=74.5513

No of moles=5 ➗ 74.5513

No of moles=0.067

Volume in liters=No of moles ➗ molarity

Volume in liters=0.067 ➗ 0.15

Volume in liters=0.45L

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Explanation:

Phenolphthalein acts like a weak acid, so in aqueous solution, it has an acid form HIn, and the conjugate base In-, and the pH of it can be calculated by the Handerson-Halsebach equation:

pH = pKa + log[In-]/[HIn]

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ii) pH = 2.1

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iii) pH = 7.8

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iv) pH = 11.5

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[In-]/[HIn] = $10^{1.8}$

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