A sample of magnesium chloride was reacted with calcium hydroxide and the ammonia gas was dissolved in 50.0cm3 of 0.01m sulphuric (iv) acid which was in excess.From the resulting solution,25cm3 was filtrated against sodium hydroxide solution of 0.2molar and 25.0cm3 of the base we're needed for complete neutralisation.write a balanced equation for the reaction between ammonium salt and calcium hydroxide.
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0.5 mol of sodium hydroxide is dissolved in 2 dm3 of water. Calculate the concentration of the sodium hydroxide solution formed.
Concentration~in~mol/dm^{3} = \frac{amount~of~solute~in~mol}{volume~in~dm^{3}}
Concentration = \frac{\textup{0.5~mol}}{\textup{2~dm}^3}
Concentration = 0.25 mol/dm3
Volume units
Volumes used in concentration calculations must be in dm3, not in cm3. It is useful to know that 1 dm3 = 1000 cm3. This means:
divide by 1000 to convert from cm3 to dm3
multiply by 1000 to convert from dm3 to cm3
For example, 250 cm3 is 0.25 dm3 (250 ÷ 1000). It is often easiest to convert from cm3 to dm3 before continuing with a concentration calculation.
Explanation:
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