Chemistry C3

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Created by: Ben
Created on: 22-03-12 20:39

How is the concentration of an acid calculated? (F

Concentration = Moles/Volume

(Remember Tip: Moles/Voles)

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How can the concentration of an unknown solution b

By using a titration.

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How can the concentration of a solution be calcula

Step 1 : Mol KNOWN = C x V = Concentration X Volume (In dm^3, or divide cm^3 by 1000)

e.g. 0.1 x 24.7/1000 = 0.00247 mol

Step 2 : Deduce mol of unknown

e.g. Mol of HCl = 2 Mol NaOH

Step 3 : Calculate Conc. of unknown

Conc = Mol/Vol

e.g. 0.00247/0.025 = 0.0988 mol dm^-3

(The final calculation is from when Mr Penrose did a titration - where the unknown had a concentration of 0.1 mol dm^-3.) This shows that it isnt 100% accurate.)

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There is a ratio of 20% water to 80% ethanol, whic

The solvent is ethanol, as there is more of it.

The water is a solute.

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What does homogeneous mean?

It means equally dispersed.

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If you heat water, what happens to its solubility?

It increases, until it starts boiling, where it doesn't have a solubility*.

*I think its right, but it could well be wrong.

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What are negatives of hard water? Also, what cause

1
- No/Minimal Lather
- Formation of SCUM!
- Causes Washing Machines and Appliances to wear out faster
2
- It is caused by the presence of Mg2+ and Ca2+ (Both are Group 2 Elements)

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