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3 years ago

A substance with a ph of 9 has

Chemistry

1 answer:

Arisa [49]3 years ago

4 0

Answer:

c) more OH⁻ ions than H₃O⁺ ions

Explanation:

A substance with a PH of 9 implies that it has more OH⁻ ions than H₃O⁺ ions.

Such substances are said to be an alkaline or a base.

A base is a substance the produces excess hydroxyl ion in aqueous solutions.

An acid will produce excess hydroxonium ions in a solution.

So, the pH scale is used to indicate whether a substance is an acid or base or non of them.

Acids have pH of less than 7

Bases have pH of > 7

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What is the final pH of a solution when 0.1 moles of acetic acid is added to water to a final volume of 1L?

kicyunya [14]

Answer:

The pH of solution is 2.88 .

Explanation:

The reaction is :

$CH_3COOH-->CH_3COO^-+H^+$

We know, $K_a$ for this reaction is = $1.76\times 10^{-5}.$

Also, since volume of water is 1 L.

Therefore, molarity of solution is equal to number of moles.

Also, $K_a=\dfrac{[CH_3COO^-][H^+]}{[CH_3COOH]}$

Let, amount of $CH_3COO^- and\ H^+$ produce is x.

So,

$K_a=\dfrac{[x][x]}{[0.1]}\\1.76\times 10^{-5}=\dfrac{[x][x]}{[0.1]}$

$x=0.0013\ mol.$

We know, $pH=-log{x}=-log(0.0013)=2.88$

Therefore, pH of solution is 2.88 .

Hence, this is the required solution.

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Read 2 more answers

If the volume of oxygen gas is 259 cm3 at 112 kPa, what would the volume be at 101.3 kPa?

NARA [144]

Answer:

<h3>The answer is 286.36 cm³</h3>

Explanation:

In order to find the volume be at 101.3 kPa we use Boyle's law which is

$P_1V_1 = P_2V_2$

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

$V_2 = \frac{P_1V_1}{P_2} \\$

From the question

P1 = 112 kPa = 112000 Pa

V1 = 259 cm³

P2 = 101.3 kPa = 101300 Pa

We have

$V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...$

We have the final answer as

Hope this helps you

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3 years ago