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sergeinik [125]
3 years ago
7

When the pH test is done with a yellow litmus paper, it turns blue. This color change indicates that the solution is___

Chemistry
1 answer:
kati45 [8]3 years ago
8 0

Answer:

A basic solution such as hydroxyls

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Determine the percent water in MgSO4*7H20?
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\% H_2O=51.2\%

Explanation:

Hello!

In this case, since the percent water is computed by dividing the amount of water by the total mass of the hydrate; we infer we first need the molar mass of water and that of the hydrate as shown below:

MM_{MgSO_4* 7H_2O}=120.36 g/mol+7*18.02g/mol\\\\MM_{MgSO_4* 7H_2O}=246.5g/mol

Thus, the percent water is:

\% H_2O=\frac{7*MM_{H_2O}}{MM_{MgSO_4* 7H_2O}} *100\%\\\\

So we plug in to obtain:

\% H_2O=\frac{7*18.02}{246.5} *100\%\\\\\% H_2O=51.2\%

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