F321.3: Moles, Equations and Acids

Cards which contain all the definitions, and some explanations and formulae, for Unit 1.3, Moles, Equations and Acids.

Amount of Substance

Measured in moles and given the symbol n.

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Avogadro's Constant (NA)

The number of particles per mole; equal to 6.02 x 10^23

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Moles and Particles

Moles = no. of particles/6.02 x 10^23

No. of particles = moles x 6.02 x 10^23

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Moles and Mass

Mass(g) = moles x molar mass

Moles = mass/molar mass

Molar mass = mass/moles

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Molar Mass (Mr)

The mass of 1 mole of a substance.

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Empirical Formula

The lowest whole number ratio of atoms of each element in a compound.

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Molecular Formula

The actual ratio of number of atoms of each element in a compound.

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Moles in Solution

Moles = concentration (moldm-3) x volume (dm3)

Concentration = moles/volume

Volume = moles/concentration

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Moles in Gas

Volume(dm^3) = moles x 24

Moles = volume/24

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Proton donor.

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Proton acceptor.

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A soluble base which releases OH- ions in solution.

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Formed when the H+ ion of an acid is replaced by a metal ion or ammonium ion (NH4^+)

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Anhydrous Salt

The compound which remains when the water of crystallisation is removed from a hydrated salt.

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Hydrated Salt

A complex compound which has water molecules incorporated.

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Water of Crystallisation

Water molecules which make up part of the crystal structure of a compound and are easily removed by heating.

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