An acid-base equilibria involves the transfer of protons. In such equilibria the acid donates a proton to the base. Since these reactions are reversible there is an acid and base on both sides of the equation, they are called conjugate acid-base pairs. Example 1: an acid with water In the forward reaction HA donates a proton to the

FACTFILE: GCE CHEMISTRY / ANSWERS TO A2 1 FACTFILES k = 0.18/0.052 = 72 mol-1 dm3 s-1 [2] 4.4 Equilibrium 1.(i) Kc = [CH COOH][C H OH] [CH COOC H ][H O] 3 5 11 3 5 11 2 [1] (ii) converting g to mol C5H11OH + CH3COOH ⇌ CH3COOC5H11 + H2O initial moles 0.0125 0.02 0 0 equilibrium moles 0.0025 0.01 0.01 0.01 Kc = [CH COOH][C H OH] [CH COOC H ][H ...

CCEA Chemistry. Unit A2 1: Further Physical and Organic Chemistry. 4.5 Acid-base equilibria. 4.5.1 use the Brønsted–Lowry theory of acids and bases to describe proton transfer in acid-base equilibria, including the idea of conjugate acid-base pairs;

How do you calculate [H+] from Ka? √Ka x initial conc. of acid. How do you convert from Ka to pKa? Ka = 10^-pKa. How do you calculate concentration of diluted solutions? Conc in mol dm^-3 = (moles of solute / volume of new solution) x 1000. How do you calculate pH of a strong base? [H+] = Kw / [OH-] What is a buffer solution?

CHEMISTRY pg 2 4.1 Lattice enthalpy In this topic, the lattice enthalpy of simple ionic compounds will be considered based on a Born-Haber cycle. Enthalpy of solution will also be examined. Mathematical content Calculation of missing values from a Born-Haber cycle using algebraic expressions will be expected. Learning outcomes

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(b) Ozone is 30% dissociated at equilibrium according to the following equation. 2030 302(g) (i) Calculate the value of KP for this dissociation reaction, stating its units, if the total pressure is 10 atmospheres. (ii) Explain the effect of increasing the pressure on the above equilibrium.

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This workbook contains practice questions of examination standard for the current CCEA A2 Chemistry specification. It includes space for writing answers, and a section with tips and advice on exam technique.

GCE CHEMISTRY Learning Outcomes Students should be able to: 4.4.1 calculate equilibrium concentrations given suitable data; 4.3.2 calculate the numerical values, with units, for equilibrium constants, K C, given suitable data limited to homogeneous systems; The equilibrium constant, K c For the equilbrium aA bB ⇌ cC dD