For each of the salts below, match the salts that can be compared directly, using Ksp values, to estimate solubilities.
1 answer:
Answer:
1 - Salts required that can be compared directly, using Ksp values, to estimate solubilities for copper (II) sulfide are - (Option b) ,
(Option c) and
(Option d)
2 - Salts that can be compared directly, using Ksp values, to estimate solubilities for zinc hydroxide are - (Option a)
Explanation:
values can be used to compare the solubility of salts that produce ions in a 1:1 ratio.
{copper (II)sulfide} dissociates with ions in ratio 1:1 .
Because the salts ,
and
have a 1:1 ion ratio, the solubilities of options b, c, and d can be compared to salt 1.
Values can be used to compare the solubility of salts that produce ions in a 1:2 or 2:1 ratio.
2. dissociates into ions in ratio 1:2 .
Because the ions in the salt are in a 1:2 ratio, the solubility of salt 2 can be compared to that of salt 'a'.
Hence , Salt 1 is matched with options b , c , d.
Salt 2 is matched with option a.
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Answer : The enthalpy change of reaction is -1800 kJ
Explanation :
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The given final reaction is,
The intermediate balanced chemical reaction will be,
(1)
(2)
First we will multiply reaction 1 by 2 and reverse reaction of reaction 2 by 3 then adding both the equation, we get :
The expression for final enthalpy is,
where,
n = number of moles
Therefore, the enthalpy change of reaction is -1800 kJ