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3 years ago

What is the representative particle for an element?

Chemistry

1 answer:

xz_007 [3.2K]3 years ago

3 0

Answer:

The representative particle for an element is AN ATOM.

Explanation:

Representative particle of a substance refers to the smallest unit of that substance, which can not be broken down into smaller particles. The representative particles of an element is an atom, because each element is made up of atoms, which are the smallest unit of that element; they can not be broken down further.

A representative particle is chemically identical with the parent element and will have all the properties of the parent element.

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A chemist must prepare 800ml of potassium hydroxide solution with a pH 13 of at 25. He will do this in three steps:

Naily [24]

Answer:

4.48 grams of potassium hydroxide that the chemist must be weighing out.

Explanation:

The pH of the KOH solution = 13

pH + pOH = 14

pOH = 14 - pH = 14 - 13 = 1

$pOH=-\log[OH^-]$

$1=-\log[OH^-]$

$[OH^-]=0.1 M$

$KOH(aq)\rightarrow K^+(aq)+OH^-(aq)$

1 mole of hydroxide ions are obtained from 1 mole of KOH. Then 0.1 mole of hydroxide ions will be obtained from :

$\frac{1}{1}\times 0.1 M=0.1 M$ of KOH

$[Molarity]=\frac{\text{Moles of solute}}{\text{Volume of solution(L)}}$

Volume of KOH solution = 800 mL = 0.800 L ( 1 mL = 0.001 L)

$0.1 M=\frac{\text{Moles of KOH}}{0.800 L}$

Moles of KOH = 0.1 M × 0.800 L = 0.08 mol

Mass of 0.08 moles of KOH :

0.08 mol × 56 g/mol = 4.48 g

4.48 grams of potassium hydroxide that the chemist must be weighing out.

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meriva

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Answer:

Explanation:

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