Chemistry

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Created by: Jessie Lunn
Created on: 22-01-15 14:49

Alkali

A base that dissolves in water.

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Salts from carbonates

2HCl+CaCO3-->CaCl+H2O+CO2

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Salts from bases

2HCl+CaO-->CaCl2+H2O

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Salts from alkalis

HCl+NaOH-->NaCl+H2O

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What is hydrous and anhydrous?

hydrous contains water molecules, anhydrous does not.

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Water of crystallisation

refers to water molecules that form an essential part of the crystalline structure of a compound.

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Formulas for water of crystallisation

Use n=m/Mr of anhydrous and of water molecules. Determine formula from answers.

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Titrations

1. use a pipette to measure volume of one solution into flask. 2. other solution placed into burette. 3. solution in burette added to flask until end point.

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What colours do methyl orange, bromothymol blue and phenolphthalein go in acids, bases and what is their end point colour?

Methyl orange goes red in acid, yellow in bases and the end point colour is orange. Bromothymol goes yellow in acid, blue in base and green is the end point colour. Phenolphalein is colourless in acid, pink in bases and end point colour is pale pink.

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