wants to make a 1 liter solution of 0.5 M alanine at pH 2.6. The pKa of carboxylic acid is 2.34 and the pKa of α-amino group is 9.60. Use this information to answer questions 1-4. Which groups would be fully protonated or fully deprotonated at this pH?

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Ответ:

carolhubble

23.04.2022

Chemistry

$\large \boxed{4.81 \times 10^{-22} \text{ g Mg}}$

Explanation:

We will need a balanced equation with masses, moles, and molar masses, so let’s gather all the information in one place.

Mᵣ: 24.30

Mg + 2H⁺ ⟶ Mg²⁺ + H₂

n/mol: 1.98 × 10⁻²³

1. Calculate the moles of Mg

The molar ratio is 1 mol Mg:1 mol H₂

$\rm \text{Moles of Mg} =1.98 \times 10^{-23} \text{ mol H}_{2} \times \dfrac{\text{1 mol Mg}}{\text{1 mol H}_{2}} = 1.98 \times 10^{-23} \text{ mol Mg}$

2. Calculate the mass of Mg

$\text{Mass of Mg} = 1.98 \times 10^{-23} \text{ mol Mg} \times \dfrac{\text{24.30 g Mg}}{\text{1 mol Mg}} = \mathbf{4.81 \times 10^{-22}} \textbf{ g Mg}\\\\\text{The mass of Mg reacted is $\large \boxed{\mathbf{4.81 \times 10^{\mathbf{-22}} \textbf{ g Mg}}}$}$

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