Chemistry C3 4.4 Titration calculations.

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Created by: Atlanta and Jacob
Created on: 14-03-16 17:47

How can concentrations of solutions be measured?

In g/dm^3 (grams per decimetre cubed) or mol/dm^3 (moles per decimetre cubed).

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How can concentrations be calculated?

From the mass of solute dissolved in a known volume of solution.

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How can the mass of solute in any volume of solution be calculated?

From its concentration.

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If the concentration of one of the solutions used in a titration is known, what can the results of the titration be used for?

To calculate the concentration of the other solution.

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If the mass or the number of moles of a substance dissolved in a given volume of solution is known, what can be calculated?

Its concentration.

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If the volume of a solution and its concentration is known, what can be calculated?

The mass or the number of moles of the substance in any volume of solution.

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50cm^3 of solution was made using 5.6g of potassium hydroxide, KOH. What is its concentration in g/dm^3 and mol/dm^3?

1cm^3 of solution contains (5.6/50)g – so 1dm^3 of solution contains (5.6/50)x1000g=112g – concentration of solution=112g/dm^3. 1 mole KOH=(39+16+1)g=56g -112g/56g=2 mole – concentration of solution=2 mol/dm^3.

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What is the mass of sodium hydroxide in 100cm^3 of a solution with a concentration of 0.2mol/dm^3?

100cm^3 contains 100x0.2/1000mol=0.02mol – 1mol NaOH=40g – 0.02x40=8g.

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What are titrations used to find?

The volumes of solutions that react exactly.

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What is the equation for calculations relating to titration?

Number of moles = mass in grams/relative formula mass.

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***YOU MUST BE ABLE TO BALANCE SYMBOL EQUATIONS FOR THESE REACTIONS AND CALCULATE AMOUNTS OF SUBSTANCES FROM TITRATION RESULTES AND APPLY THESE SKILLS TO SOLVING PROBLEMS SO LOOK THEM UP!!!!***

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