Chemistry: Asolution has a poh of 7.1 at 10∘c. what is the ph of the solution given that kw=2.93×10−15 at this temperature? remember to report your answer with the correct number of significant figures

Asolution has a poh of 7.1 at 10∘c. what is the ph

Ответ:

emily4984

12.03.2022

Chemistry

Answer : The pH of the solution is, 7.4

Explanation : Given,

pOH = 7.1

$K_w=2.93\times 10^{-15}$

First we have to calculate the value of pK_w .

The expression used for the calculation of pK_w is,

$pK_w=-\log [K_w]$

Now put the value of K_w in this expression, we get:

$pK_w=-\log (2.93\times 1-^{-15})$

$pK_w=15-\log (2.93)$

pK_w=14.5

Now we have to calculate the pH of the solution.

As we know that,

pH+pOH=pK_w

Now put all the given values in this formula, we get:

pH+7.1=14.5

pH=7.4

Therefore, the pH of the solution is, 7.4

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Ответ:

SmokeyRN

21.12.2020

Chemistry

The correct answer is Option A.

Explanation:

We are given:

4.5 wt % of Pb means that 4.5 grams of lead is present in 100 g of alloy.

95.5 wt % of Sn means that 95.5 grams of tin is present in 100 g of alloy.

To calculate the atom percent of any compound in a mixture, we use the equation:

$\text{atom }\%=\frac{\text{Moles of compound}\times N_A}{\text{Total number of moles of mixture}\times N_A}\times 100$

where,

N_A = Avogadro's number

Moles of a compound is given by the formula:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

For Lead:

Given mass of lead = 4.5 g

Molar mass of lead = 207.19 g/mol

$\text{Atom percent of lead}=\left(\frac{\frac{4.5g}{207.17g/mol}\times N_A}{(\frac{4.5g}{207.17g/mol}+\frac{95.5g}{118.71g/mol})\times N_A}\right)\times 100\\\\\text{Atom percent of lead}=2.6\%$

For Tin:

Given mass of tin = 95.5 g

Molar mass of tin = 118.71 g/mol

$\text{Atom percent of Tin}=\left(\frac{\frac{95.5g}{118.71g/mol}\times N_A}{(\frac{4.5g}{207.17g/mol}+\frac{95.5g}{118.71g/mol})\times N_A}\right)\times 100\\\\\text{Atom percent of Tin}=97.4\%$

Hence, the correct answer is Option A.

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Asolution has a poh of 7.1 at 10∘c. what is the ph of the solution given that kw=2.93×10−15 at this temperature? remember to report your answer with the correct number of significant figures

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