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→Calculating Concentration
'' '''concentration (g/dm<sup>3</sup>)''' '' = <math>\frac{mass (g)}{volume (dm^3)}</math>
'' '''concentration''' '' = <math>\frac{117}{0.5}</math>
'' '''concentration''' '' = 234g/dm<sup>3</sup>
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'''Calculate the Concentration:'''
'' '''concentration (g/dm<sup>3</sup>)''' '' = <math>\frac{mass (g)}{volume (dm^3)}</math>
'' '''concentration''' '' = <math>\frac{28}{0.1}</math>
'' '''concentration''' '' = 280g/dm<sup>3</sup>
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'''Calculate the Concentration:'''
'' '''concentration (g/dm<sup>3</sup>)''' '' = <math>\frac{mass (g)}{volume (dm^3)}</math>
'' '''concentration''' '' = <math>\frac{73}{0.4}</math>
'' '''concentration''' '' = 182.5g/dm<sup>3</sup>
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====Concentration as Molarity====
{| class="wikitable"
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| style="height:20px; width:300px; text-align:center;" |117g of [[NaCl]] is [[dissolve]]d in 0.5dm<sup>3</sup> of [[water]]. Calculate the [[concentration]] in g/dm<sup>3</sup>.
| style="height:20px; width:300px; text-align:center;" |28g of [[KOH]] is [[dissolve]]d in 100ml of [[water]]. Calculate the [[concentration]] in g/dm<sup>3</sup>.
| style="height:20px; width:300px; text-align:center;" |73g of [[HCl]] is [[dissolve]]d in 400ml of [[water]]. Calculate the [[concentration]] in g/dm<sup>3</sup>.
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'''Find the number of [[mole]]s.'''
[[mass]] = 117g
[[Relative Formula Mass]] = 58.5g
Number of [[Mole]]s of a [[Compound]] = ([[Mass]] of [[compound]])/([[Relative Formula Mass]] of [[compound]])
Number of [[Mole]]s = <math>{\frac{m}{M_r}}</math>
Number of [[Mole]]s = <math>{\frac{117}{58.5}}</math>
Number of [[Mole]]s = 2mol
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'''State the [[mass]] in [[gram]]s and the [[Volume (Space)|volume]] in dm<sup>3</sup>:'''
'''Find the number of [[mole]]s.'''
[[mass]] = 28g
[[Relative Formula Mass]] = 56g
Number of [[Mole]]s of a [[Compound]] = ([[Mass]] of [[compound]])/([[Relative Formula Mass]] of [[compound]])
Number of [[Mole]]s = <math>{\frac{m}{M_r}}</math>
Number of [[Mole]]s = <math>{\frac{28}{56}}</math>
Number of [[Mole]]s = 0.5mol
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'''Find the number of [[mole]]s.'''
[[mass]] = 73g
[[Relative Formula Mass]] = 36.5g
Number of [[Mole]]s of a [[Compound]] = ([[Mass]] of [[compound]])/([[Relative Formula Mass]] of [[compound]])
Number of [[Mole]]s = <math>{\frac{m}{M_r}}</math>
Number of [[Mole]]s = <math>{\frac{73}{36.5}}</math>
Number of [[Mole]]s = 2mol
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[[Volume (Space)|volume]] = 0.5dm<sup>3</sup>
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[[Volume (Space)|volume]] = 100ml
The [[Volume (Space)|volume]] must be converted into dm<sup>3</sup> from ml.
[[Volume (Space)|volume]] in dm<sup>3</sup> = ([[Volume (Space)|volume]] in ml)/1000
[[Volume (Space)|volume]] = 0.1dm<sup>3</sup>
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[[Volume (Space)|volume]] = 400ml
The [[Volume (Space)|volume]] must be converted into dm<sup>3</sup> from ml.
[[Volume (Space)|volume]] in dm<sup>3</sup> = ([[Volume (Space)|volume]] in ml)/1000
[[Volume (Space)|volume]] = 0.4dm<sup>3</sup>
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'''Calculate the Concentration:'''
'' '''concentration (mol/dm<sup>3</sup>)''' '' = <math>\frac{mass (g)}{volume (dm^3)}</math>
'' '''concentration''' '' = <math>\frac{117}{0.5}</math>