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Chemistry
A Level

Calculate the pH of a 0.025 mol dm-​3​ solution of methanoic acid. For HCOOH, Ka = 1.58 x 10-​4​ mol dm-​3

This question is an acid calculation question so it requires you to recall key formulas relating to weak acids. As the Ka of HCOOH has been given, I would start by writing an expression for Ka. Ka= [HCOO-...

Answered by Radia H. Chemistry tutor
13454 Views

How does Hydrogen bonding arise in Water?

Hydrogen bonding occurs in water due to the large electronegativity difference between the hydrogen atoms and the oxygen atom.The oxygen attracts the shared pair of electrons towards itself leaving the hy...

Answered by Chemistry tutor
4095 Views

How do you calculate lattice enthaply?

You can't directly measure lattice enthalpy of a solid crystal, so you have to look at a different method. Usually this would be experimentally or using Hess's Law to construct a Born-Haber cycle. The Bor...

Answered by Chemistry tutor
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Describe the bonding in, and the structure of, sodium chloride and ice. Explain why they have very different melting points.

(Firstly, we identify this as a ‘Structure and Bonding’ problem and try to distinguish between the bonds holding atoms together and the intermolecular forces holding molecules together. We can take ea...

Answered by Georgia K. Chemistry tutor
16368 Views

In the topic of transition metals, what are the different types of ligands and what in itself, is a ligand?

Firstly, ligands are an atom, molecule or ion which can donate a electron pair (lone electron pair). In a diagram, we would show this donation of a lone electron pair to a central metal ion by using a arr...

Answered by Chemistry tutor
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