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State what is meant by term enthalpy change of neutralisation

Formation of 1 mole of water from neutralisation under standard conditions (OCR A)

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How do buffer solutions work and how do you calculate the pH of a buffer solution?

First consider what a buffer is and what a buffer can be made from. A buffer is a solution resisting change in pH formed from a weak acid and its salt (a conjugate acid base pair), or from any weak acid a...

Answered by • Chemistry tutor

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Without calculation, predict (giving you reasoning) whether the entropy change for the following reaction will be significantly positive, significantly negative or approximately zero: MgO(s) + CO2 (g) --> MgCO3 (s)

Significantly negative. A gas is turning into a solid thus there is less of a tendency towards randomness.

Answered by Isobel M. • Chemistry tutor

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Describe why NaCl has a high melting point

NaCl is an ionically bonded substance, with a giant ionic lattice structureThe Na+ and Cl- ions are bonded by strong ionic bonds within the lattice, and due to the high strength of these bonds, lots of en...

Answered by Krishan B. • Chemistry tutor

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