AICI, + NaNaCl + Al Did Al change oxidation number? yes No

Chemistry

1 answer:

mezya [45]2 years ago

3 0

Answer:

Yes, Al change oxidation number

Explanation:

$AlCl_3 +Na >NaCl+Al$

For a free element, oxidation number is 0.

Na and Al are free elements we find in the equation as they are not in combination with other elements.

For a compound, the sum of oxidation number of elements = 0.

We know oxidation number of chlorine is -1.

So let us find the oxidation number of Al in $AlCl_3$

Let x be the oxidation number of Al so,

$AlCl_3=x+(3\times-1)=0\\\\x-3=0\\\\ x= +3$

Oxidation number of Al in $AlCl_3$ is +3

Oxidation number of Al changes from +3 to 0.

Decrease in oxidation number indicates $AlCl_3$ is getting reduced in the reaction.

Na oxidation number increases from 0 to +1 shows Na is getting oxidised in the reaction

The change in oxidation number of the elements represents a redox reaction where both oxidation and reduction takes place simultaneously.

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anastassius [24]

Answer: Option (c) is the correct answer.

Explanation:

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This is because a buffer has the ability to not get affected by the addition of small amounts of an acid or a base. As a result, it helps in maintaining the pH of the solution.

In the give case, when we add the HCl then more number of protons will dissociate. This causes the acetate to react with the protons and leads to the formation of acetic acid.

We know that acetic acid is a weak acid and it dissociates partially or feebly. Therefore, no change in pH will take place.

Thus, we can conclude that equation $H_{3}O^{+}(aq) + C_{2}H_{3}O^{-}_{2}(aq) \rightarrow HC_{2}H_{3}O_{2}(aq) + H_{2}O(l)$ represents the chemical reaction that accounts for the fact that acid was added but there was no detectable change in pH.