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zavuch27 [327]
3 years ago
9

Calcium carbonate () is 34.5% Ca by mass. In a 418 g sample of , how many grams of calcium are present?

Chemistry
1 answer:
erastovalidia [21]3 years ago
8 0

Answer:

144.2 g of Ca are present in 418 g of sample

Explanation:

34.5 % Ca → In 100 g of salt there are 34.5 g of Ca

Let's make a rule of three:

In 100 g of salt there are 34.5 g of Ca

In 418 g of salt there must be (418 . 34.5) / 100 = 144.2 g

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If aqueous solution of lead (ll) nitrate and sodium sulfate, which insoluble precipitate is formed
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Answer:

Lead(II) sulfate

Explanation:

This looks like a double displacement reaction, in which the cations change partners with the anions.

The possible products are

Pb(NO₃)₂ (aq)+ Na₂SO₄(aq) ⟶PbSO₄(?) + 2NaNO₃(?)

To predict the product, we must use the solubility rules. Two important ones for this question are:

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Thus, NaNO₃ is soluble and PbSO₄ is the precipitate.

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Give the mathematical relationship for an unsaturated solution in comparing Q with K sp:__________.
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Answer:

Q < Ksp

Explanation:

The general equilibrium of a constant product solubility, ksp, is:

AB ⇄ A⁺ + B⁻

<em>Where Ksp is defined as:</em>

Ksp = [A⁺] [B⁻]

When [A⁺] [B⁻] = Ksp, the solution is saturated or oversaturated because there are the maximum amount of ions that solution can dissolve.

When the solution is oversaturated, AB is produced.

Now, in a unsaturated solution, the [A⁺] [B⁻] is less than the maximum amount that can be dissolved. That means:

[A⁺] [B⁻] = Q < Ksp

Q is defined in the same way than Ksp, just in Q the system is not in equilibrium.

Right answer is:

<h3>Q < Ksp</h3>
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I think it's the Pentium up
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