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vampirchik [111]
3 years ago
9

20 ml of an approximately 10% aqueous solution ofethylamine, ch3ch2nh2, is titrated with 0.3000 maqueous hcl.which indicator wou

ld be most suitablefor this titration? the pkaof ch3ch2nh3+is 10.75.
Chemistry
1 answer:
S_A_V [24]3 years ago
5 0

phenolphthalein would be most suitable
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Answer:

pH = 12.08

Explanation:

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First we <u>calculate how many moles of each substance were added</u>, using <em>the given volume and concentration</em>:

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As HBr is a strong acid, it dissociates completely into H⁺ and Br⁻ species. Conversely, KOH dissociates completely into OH⁻ and K⁺ species.

As there are more OH⁻ moles than H⁺ moles (5.55 vs 3.75), we <u>calculate how many OH⁻ moles remain after the reaction</u>:

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With that<em> number of moles and the volume of the mixture</em>, we <u>calculate [OH⁻]</u>:

  • [OH⁻] = 1.8 mmol / (75 mL + 74 mL) = 0.0121 M

With [OH⁻], we <u>calculate the pOH</u>:

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With the pOH, we <u>calculate the pH</u>:

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