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4 years ago

When the hydronium ion concentration of a solution is increased by a factor of 10, it means that

Chemistry

1 answer:

Dahasolnce [82]4 years ago

4 0

Answer: The pH of the solution will decrease by 1 unit.

Explanation:

Let say the hydronium ion concentration of a solution is 0.001

pH = - log [H+]

= -log 1.0 x 10^3 = 3

if the hydronium ion concentration is increased by 10 , that is: 0.001 x 10 = 0.01

pH = -log [1.0 x 10^2]

= 2

Therefore, the pH is reduced by 1 unit when the hydronium ion concentration is increased by a factor of 10.

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If 65.5 ml of HCl stock solution is used to make 450 ml of a 0.675 M HCl dilution, what is the molarity of the stock solution ?

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Answer: The molarity of the stock solution is 4.64 M

Explanation:

To calculate the molarity of the diluted solution, we use the equation:

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the molarity and volume of the stock solution

$M_2\text{ and }V_2$ are the molarity and volume of diluted solution

We are given:

$M_1=?M\\V_1=65.5mL\\M_2=0.675M\\V_2=450mL$

Putting values in above equation, we get:

$M_1\times 65.5=0.675\times 450\\\\M_1=4.64M$

Hence, the molarity of the stock solution is 4.64 M

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