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Aleksandr [31]
3 years ago
5

A 50.0-ml volume of 0.15 m hbr is titrated with 0.25 m koh. calculate the ph after the addition of 11.0 ml of koh. express your

answer numerically.
Chemistry
1 answer:
gayaneshka [121]3 years ago
4 0
<span>pH = 1.1 First, determine how many moles of each reactant was used Moles HBr = 0.0500 l * 0.15 mol/l = 0.0075 mol Moles KOH = 0.0110 l * 0.25 mol/l = 0.00275 mol Now determine how much acid (HBr) is left over after the rest of it is neutralized by the KOH. A simple matter of subtraction. 0.0075 - 0.00275 = 0.00475 mol Now determine the molarity of HBr. That would be moles per volume, so 0.00475 mol / (0.0500 l + 0.0110 l) = 0.00475 mol / 0.061 l = 0.077868852 mol/l = 0.077868852 m Now since HBr is a strong acid, it will completely dissociate into H+ and Br- ions. So the molarity of the H+ ions will be the same as the molarity of HBr. And the definition of pH is pH = - log(H+) So the log of 0.077868852 is -1.108636228 And the negation of that is 1.108636228 So the pH is 1.1 to 2 significant figures since that's the precision of the data we were given.</span>
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Considering the definition of Avogadro's number:

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<h3>Definition of Avogadro's number</h3>

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

<h3>Amount of molecules in this case</h3>

You can apply the following rule of three, considering the Avogadro's number:  If 1 mole of lithium contains 6.023×10²³ molecules, 2.7 moles of lithium contains how many molecules?

amount of molecules of lithium= (6.023×10²³ molecules × 2.7 moles)÷1 mole

<u><em>amount of molecules of lithium=1.62621×10²⁴ molecules</em></u>

Finally, the number of molecules of lithium is 1.62621×10²⁴ molecules.

On the other hand you can apply the following rule of three, considering the Avogadro's number:  If 1 mole of sodium chloride​ contains 6.023×10²³ molecules, 1.8 moles of  sodium chloride​ contains how many molecules?

amount of molecules of sodium chloride= (6.023×10²³ molecules × 1.8 moles)÷1 mole

<u><em>amount of molecules of sodium chloride=1.08414 ×10²⁴ molecules</em></u>

Finally, the number of molecules of sodium chloride is 1.08414×10²⁴ molecules.

Learn more about Avogadro's Number:

brainly.com/question/11907018

brainly.com/question/1445383

brainly.com/question/1528951

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