The CONCENCENTRATION of a given substance in a chemical soluton is the amount or quantity of that substance present in one litre (1L) or one decimetre cube (1dmΒ³) of the given solution.

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The quantity of the substance can be measured in different units, such as:- kilograms (Kg), grams (g), milligrams (mg), microgram (Ug) mole (mol), e.t.c

Since the concentration of a particular substance present in a given solution means the quantity of the substance present in one litre volume of the substance, it simply implies that the unit of measurement of are as follows:-π

1. Kilogram per litre (Kg/L), π. (if the mass quantity is measured in kiligram)

2. grams per litre (g/L), π (if the mass quantity is measured in gram)

3. Miligrams per litre (mg/L), π (if the mass quantity is measured in miligram)

4. moles per litre (mol/L), π (if the mass quantity is measured in moles)

*NOTE:-*

per litre means π in one litre.

*NOTE THIS…*π

The concentration of a substance is said to be expressed in *part per million* when it is expressed in milligrams per litre (mg/L).

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So, it simply means that mg/L is the same as ppm

In summary,ππΎ

1mg/L = 1ppm

Part Per Million (ppm) is used to express very low concentration

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In order to convert a given contraction of a substance given to you from other concentration units to ppm unit, all you need to do is to…ππΎ

πTo convert a given concentration to ppm, all you need to do is to:-

Convert the mass given in the question to milligram (mg) unit

And then

ππΎ Convert the volume given to you to Litres (L).

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*TAKE NOTE OF THE FOLLOWING CONVERSION*

g to mg

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To convert from gram to milligram, ππΎ *multiply with 1,000*

But from milligram to gram, divide by 1,000.

Kg to mg

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To convert from kilogram to milligram, ππΎ *multiply with 1,000,000*

But from milligram to kilogram, divide by 1,000,000

Ug to g

To convert mass from microgram unit to gram unit, we divide with one million (10^6) or we multiply with 10^-6.

But to convert from gram (g) to microgram (mg), we multiply with one million (10^6) or we divide with 10^-6.

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If you wish to convert from other concentration units to ppm unit, ππΎ, all you need to do is to:-

*Convert the mass given to you to milligram and convert the volume given to you to Litre*,

Then find out the quantity of the substance that would be contained in 1L of the solution.

*The mass (in miligrams) of a substance contained in 1L of a solution is the ppm of the substance*

For instance, ππΎ

*If 420mg of a salt is contained in 1L of a solution, then the concentration is said to be 420mg/L, which is the same as 420ppm*

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Alternatively, ππΎ

If the solution of a salt contains 1,000mg of the salt in 2L of solution, then the ppm equivalent of this is calculated as followsππΎ

*Since 2L contains 1,000mg*

Therefore

*1L will contain x*

x = 1,000/2

x = 500mg

So, in ppm, we have it as *500ppm*

Remember, ppm is the quantity of the substance in milligrams contained in 1L of the solution.

Or

*We can simply use common sence on this as follows;-

Since 2L contains 1,000mg according to the question, therefore, 1L will contain 500mg of the salt*

Answer = 500ppm.

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*VOLUME CONVERSIONS*

ml to L

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*To convert volume, from mililitre (ml) to litre (L), we divide with 1,000*,

But from *litre to millilitre, multiply with 1,000*

mΒ³ to L

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To convert volume from metre cube (mΒ³) to litre (L), we multiply with 1,000,

But from litre to metre cube, we divide with 1,000

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*FROM THE CATALYST*

Now, solve these 5 questions in the next post and submit your answers into the comment box bellow the the last question.

Do your rough works on a rough paper and pick the correct options and submit into the comment box.

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Goodluck…

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