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Roman55 [17]
4 years ago
9

How do you know if the reaction is exothermic or endothermic if both phase are same?

Chemistry
1 answer:
GrogVix [38]4 years ago
8 0
So if the sum of the enthalpies of the reactants is greater than the products, the reaction will be exothermic. If the products side has a larger enthalpy, the reaction is endothermic. You may wonder why endothermic reactions, which soak up energy or enthalpy from the environment, even happen
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During a class demonstration the potassium exploded. Suggest what might have caused this to happen
tatiyna
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3 years ago
Why do scientists use the scientific method?
xeze [42]

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3 years ago
If only 0.186 g of Ca(OH)2 dissolves in enough water to give 0.230 L of aqueous solution at a given temperature, what is the Ksp
Lilit [14]

Answer:

Ksp=5.20x10^{-6}

Explanation:

Hello there!

In this case, according to the solubility equilibrium of calcium hydroxide:

Ca(OH)_2\rightleftharpoons Ca^{2+}+2OH^-

Whereas the equilibrium expression is:

Ksp=[Ca^{2+}][OH^-]^2

It is firstly necessary to calculate the molar solubility given the grams and volume of the dissolved solute:

s=\frac{0.186g/(74.09g/mol)}{0.230L}=0.0109M

Now, according to the Ksp expression, we plug in s as the solubility to obtain:

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Regards!

8 0
3 years ago
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