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svlad2 [7]
3 years ago
12

The pKa of benzoic acid is 4.2. At pH 2.0, it will exist mainly as and occupy the layer. At pH 4.2, it will exist mainly as and

occupy the:_______________
Chemistry
1 answer:
kogti [31]3 years ago
7 0

Answer:

pH 2.0; benzoic acid, layer: organic

pH 4.2; benzoic acid and benzoate anion, water layer

Explanation:

pH2.0: a lower PH than the pKa it becomes protonated and remains in the organic layer as benzoic acid, organic layer:

pH 4.2: at pH of 4.2 moves to the benzoic acid and benzoate anion, layer: water and organic

pH 12.0: at pH above the pKa it is more soluble in water hence benzoate anion, layer: water

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How many moles of hydrogen gas can be produced if 0.78 moles of hydrochloric acid reacts with excess solid zinc according to the
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Answer:

The answer to your question is It will be formed 0.39 moles of H₂

Explanation:

Data

moles of H₂ = ?

moles of HCl = 0.78

moles of Zinc = excess

Balanced chemical reaction

              2 HCl  +  Zn  ⇒  1 H₂  +  ZnCl₂

Process

1.- Use proportions to solve this problem. Consider the coefficients of the balanced reaction.

               2 moles of HCl ---------------------- 1 mol of H₂

               0.78 moles of HCl -----------------  x

               x = (0.78 x 1) / 2

- Simplification

              x = 0.78 / 2

- Result

              x = 0.39 moles of H₂

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