Category: Chemistry

Titration definitions 0

Titration definitions

Background   PPE Personal protective equipment Accuracy The proximity of a measurement to the true value, or the average of measurements Precision Repeatability = how close a set of measurements are to each other...

Hydrolysis 0

Hydrolysis

Most salts are strong electrolytes and exists as ions in aqueous solution. These ions do not react with water, and have no effect on the pH of the solution Some ions, however, react to...

Buffers 0

Buffers

A buffer solution is one which resists changes in pH when small quantities of an acid or alkali are added to it. Buffers are commonly made up of a weak acid and its conjugate...

pH Scale 0

pH Scale

This is a measurement of the acidity and basity of a solution. The pH of a solution is defined as: The negative logarithm of the concentration of hydrogen ions in solution. pH = -log[H+]...

Properties of acids and bases 0

Properties of acids and bases

Acids (aq) Are electrical conductors Turn blue litmus red Have a sour taste React with active metals to form hydrogen gas and a salt React with carbonates and hydrogencarbonates to form CO2, a salt...

Factors affecting equilibrium 0

Factors affecting equilibrium

How changes affect a chemical reaction equilibrium system can be predicted using Le Châtelier’s principle: If a system at equilibrium is subjected to a change in conditions, the system will adjust to re-establish equilibrium...

Equilibrium 0

Equilibrium

 Some reactions do not go to completion. The system still remains as a mixture of products and reactants. These such reactions are reversible reactions. When reactants are mixed together, the forward reaction is initially...

Equilibrium law 0

Equilibrium law

At any given temperature, the ration of products to reactants is always constant. This equilibrium constant, K, can be found by the formula The expression does not include any substances that are pure liquids...

Summary of factors affecting reaction rate and equilibrium 0

Summary of factors affecting reaction rate and equilibrium

Factors affecting reaction rate Nature of reactants Concentration of reaction State of subdivision of reactants Temperature Presence of a catalyst Factors affecting equilibrium Change Direction favoured Change in reaction rate Increase in concentration of...

Factors affecting reaction rate 0

Factors affecting reaction rate

Nature of reactants Reactions involving strong bonds are slower than those involving weak bonds. For instance, molecules often react slower at room temperature than ions in solution, so the combustion of methane at STP...

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