Standard Solution (3)

Chemistry

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Standard Solution (3)

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The reason which sodium hydroxide, NaOH is not suitable to be used for the preparation of a standard solution (1)

Because sodium hydroxide, NaOH is hygroscopic (absorbs water or moisture in the air)

The reason which sodium hydroxide, NaOH is not suitable to be used for the preparation of a standard solution (2)

Sodium hydroxide, NaOH also absorbs carbon dioxide gas, CO2 in the air to form sodium carbonate, Na2CO3

The reason which sodium hydroxide, NaOH is not suitable to be used for the preparation of a standard solution (3)

This causes difficulty to determine the exact mass of sodium hydroxide, NaOH

Another method of preparing solutions of known concentration

Is by dilution method

Dilution method

This method involves adding water to a concentrated standard solution, or known as stock solution, to produce a more diluted solution

Preparation of a Standard Solution by Diluting Aqueous Solution

During dilution, water that is added to the aqueous solution will alter the concentration of the solution but it would not alter the number of moles of solute contained in the solution

Standard solution preparation method (1)

Preparation of a Standard Solution from a Solid

Standard solution preparation method (2)

Preparation of a Standard Solution by Diluting Aqueous Solution

Other solids that can be used to prepare standard solutions in the laboratory

Solid oxalic acid H2C2O4.2H2O

The properties of sodium carbonate, Na2CO3 that is used to prepare standard solutions

Is alkaline

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