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maria [59]
3 years ago
7

Help i don't understand this

Chemistry
2 answers:
SOVA2 [1]3 years ago
6 0
The correct answer is number 4.
Novosadov [1.4K]3 years ago
3 0
The answer is 4 the answer
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romanna [79]

Answer:

The precipitate will form.

Explanation:

Let's write the equilibrium expression for the solubility product of calcium sulfate:

CaSO_4(s) ⇄ Ca^{2+}(aq)+SO_4^{2-}(aq)

The solubility product is defined as the product of the free ions raised to the power of their coefficients, in this case:

K_{sp}=[Ca^{2+}][SO_4^{2-}]=10^{-4.5}

Our idea is to find the solubility quotient, Q, and compare it to the K value. A precipitate will only form if Q > K. If Q < K, the precipitate won't form. In this case:

Q_{sp}=[Ca^{2+}][SO_4^{2-}]=5.00\cdot10^{-2} M\cdot7.00\cdot10^{-3} M=3.5\cdot10^{-4}

Now given the K value of:

K_{sp}=10^{-4.5}=3.2\cdot10^{-5}

Notice that:

Q_{sp}>K_{sp}

This means the precipitate will form, as we have an excess of free ions and the equilibrium will shift towards the formation of a precipitate to decrease the amount of free ions.

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