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pickupchik [31]
3 years ago
13

When the ph of a solution shifts from 7 to 3, how has the hydrogen ion concentration changed?

Chemistry
1 answer:
jekas [21]3 years ago
7 0
The pH is changing from 7 to 3, which means that the solution will be more acidic because the concentration of H will increase. Remember that pH=-log[H]
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Given the thermochemical equations below, What is the standard heat of formation of CuO(s)? 2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆
OlgaM077 [116]

-130KJ is the standard heat of formation of CuO.

Explanation:

The standard heat of formation or enthalpy change can be calculated by using the formula:

standard heat of formation of reaction = standard enthalpy of formation of product - sum of enthalpy of product formation

Data given:

Cu2O(s) ---> CuO(s) + Cu(s) ∆H° = 11.3 kJ

2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆H° = -287.9 kJ

CuO + Cu ⇒ Cu2O (-11.3 KJ)      ( Formation of Cu2O)

When 1 mole Cu20 undergoes combustion 1/2 moles of oxygen is consumed.

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So standard heat of formation of  formation of Cu0 as:

Cu + 1/2 02 ⇒ CuO

putting the values in the equation

ΔHf = ΔH1 + ΔH2     (ΔH1 + ΔH2  enthalapy of reactants)

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-130.65 KJ is the heat of formation of CuO in the given reaction.

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So, a gain of electrons by an atom creates an anion.</span>
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Explanation:

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Answer:

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Explanation:

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