What is the concentration of a solution if 0.25 mol is dissolved in 500 cm3 of solution?
answer choices:
1) 1 mol/dm3
2) 2 mol/dm3
3) 0.5 mol/dm3
Answers
Answer:
Solutions are formed when solutes dissolve in solvents. If the number of moles of solute and the volume of solvent used is known, the concentration of the solution can be calculated.
The concentration of a solution is meSolutions are formed when solutes dissolve in solvents. If the number of moles of solute and the volume of solvent used is known, the concentration of the solution can be calculated.
The concentration of a solution is measured in moles per litre (mol l-1) and can be calculated using this formula triangle:
An equilateral triangle pointing upwards and divided into three parts. The top part represents the number of moles. The bottom left part represents the concentration in moles per litre. The bottom right part represents the volume in litres.
Using the formula triangle gives three useful formulae:
Example one
Calculate the concentration of the solution formed when 0.25 moles of potassium nitrate are dissolved in 500 cm3 of water.
The formula we need to use, given by covering up concentration is:
Remember that the volume always has to be changed into litres.
Example two
Calculate the number of moles in 200cm3 of 0.5 mol l-1 sodium hydroxide (NaOH) solution.
Example three
Calculate the volume of sodium hydroxide used in 1 mol l-1 solution containing 2 mol of solute.
asured in moles per litre (mol l-1) and can be calculated using this formula triangle:
An equilateral triangle pointing upwards and divided into three parts. The top part represents the number of moles. The bottom left part represents the concentration in moles per litre. The bottom right part represents the volume in litres.
Using the formula triangle gives three useful formulae:
Example one
Calculate the concentration of the solution formed when 0.25 moles of potassium nitrate are dissolved in 500 cm3 of water.
The formula we need to use, given by covering up concentration is:
Remember that the volume always has to be changed into litres.
Explanation:
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