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lisov135 [29]
3 years ago
13

A buffer is made up of 0.300 L of each of 0.500 M KH2PO4 and 0.317 M K2HPO4. Assuming that volumes are additive, (a.) calculate

the pH of the buffer after the addition of 0.0500 mol of HCl to 0.600 L of buffer and (b.) the pH of the buffer after the addition of 0.0500 lol of NaOH to 0.600 L of the buffer. (pKa=7.21)
Chemistry
1 answer:
lys-0071 [83]3 years ago
8 0
<span>(b.) the pH of the buffer after the addition of 0.0500</span>
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a sample of helium occupies a volume of 101.2 mL at a pressure of 790 mmHg. at what pressure would the volume be 120 mL?
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Answer : The final pressure will be, 666.2 mmHg

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

P\propto \frac{1}{V}

or,

P_1V_1=P_2V_2

where,

P_1 = initial pressure = 790 mmHg

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V_1 = initial volume = 101.2 mL

V_2 = final volume = 120 mL

Now put all the given values in the above equation, we get:

790mmHg\times 101.2mL=P_2\times 120mL

P_2=666.2mmHg

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3 years ago
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6 0
3 years ago
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An example of a homogeneous mixture is 1. oil and vinegar dressing. 2. concrete. 3. a mixture of salt and pepper. 4. salt water
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Now, oil and vinegar dressing is not considered as a homogeneous mixture because composition is not uniform.

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Thus, salt water is the correct answer.


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