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Afina-wow [57]
3 years ago
15

What is the ph of a solution that consists of 0.50 m h2c6h6o6 (ascorbic acid) and 0.75 m nahc6h6o6 (sodium ascorbate)? ka = 6.8

´ 10-5 question 12 options: 1) 3.76 2) 3.99 3) 4.34 4) 4.57 5) 5.66?
Chemistry
1 answer:
bearhunter [10]3 years ago
4 0

Answer:

4.34.

Explanation:

  • For acidic buffer:

<em>∵ pH = pKa + log [salt]/[Acid]</em>

∴ pH = - log(Ka) + log [salt]/[Acid]

∴ pH = - log(6.8 x 10⁻⁵) + log(0.75)/(0.50)

<em>∴ pH = 4.167 + 0.176 = 4.343 ≅ 4.34.</em>

<em></em>

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4 0
3 years ago
(a) What characteristic functional group do you expect to see in the IR spectrum, that is indicative of eugenol? (b) What wavenu
Darina [25.2K]

Answer:

a) The functional group that will be evident in the IR spectrum is the OH group.

b) OH group appears between 3200-3600 cm⁻¹

c) An important impurity that have the same functional group is water.

Explanation:

Eugenol is a chemical substance that consist in a benzene that have in 1 an alcohol, in position 2 a methyl ether and in position 4 an 1-propene bonded by the terminal alkyl carbon.

a) Having this in mind, the functional group that will be evident in the IR spectrum is the OH group.

b) This OH group appears between 3200-3600 cm⁻¹

c) An important impurity that have the same functional group is water. When you have water in your sample a big signal will appear in this zone and it is possible that overlapes the OH signal of eugenol.

I hope it helps!

5 0
4 years ago
Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts what is this
Zielflug [23.3K]
<span>Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts. This type of mixture is called an alloy. 
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7 0
3 years ago
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What happens to water when it warms above 4 C
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At 4 °C, the clusters start forming. The molecules are still slowing down and coming closer together, but the formation of clusters makes the molecules be further apart. Thus, the density of water is a maximum at 4 °C.
8 0
3 years ago
I need help on thiss
Sergio039 [100]

The reaction is not balanced

<h3>Further explanation</h3>

Given

Reaction

2Fe(s)+3O₂(g)⇒2Fe₂O₃(s)

Required

The number of atoms

Solution

In a balanced chemical equation, the number of atoms in the compound that reacts (the reactants and products) will have the same number

Reactants : Fe(s)+O₂(g)

Fe = 2 atoms

O = 3 x 2 = 6 atoms

Products : Fe₂O₃(s)

Fe = 2 x 2 = 4 atoms

O = 2 x 3 = 6 atoms

The reaction is not balanced because the number of Fe atoms is not the same

The balanced reaction should be:

4Fe(s)+3O₂(g)⇒2Fe₂O₃(s)

8 0
3 years ago
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