All Quantitative chemistry and stoichiometry articles – Page 3
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ResourceEstimating the concentration of bleach
Compare the chlorine content of different bleaches and calculate the concentration of sodium hypochlorite.
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Finding the formula of copper(II) oxide
Students heat copper(II) oxide in a glass tube while passing methane over it. The copper(II) oxide is reduced to copper. If the reactants and products are weighed carefully the formula of the copper oxide can be deduced. This could also be used simply as an example of reduction.
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Unsaturation in fats and oils
Food labels and advertisements often refer to unsaturated fats and oils. A comparison of the amounts of unsaturated fats and oils present in different foodstuffs can be made by titrating solutions of samples with aqueous bromine (bromine water), which reacts with the carbon - carbon double bonds present in such fats and oils.
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Reaction of hydrogen and oxygen: reacting masses
Through the reaction of copper(II) oxide with hydrogen, the composition of water and its formula can be worked out.
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Heat energy from alcohols
This experiment compares the amounts of heat energy produced by burning various alcohols.
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Finding the formula of hydrated copper(II) sulfate
In this experiment, the water of crystallisation is removed from hydrated copper(II) sulfate. The mass of water is found by weighing before and after heating. This information is used to find x in the formula: CuSO4.xH2O.
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Determination of relative atomic mass
In this experiment you will react magnesium ribbon with dilute hydrochoric acid to produce hydrogen gas. The measured volume of hydrogen gas produced and the mass of magnesium can be used to determine the mass of magnesium required to produce one mole of hydrogen molecules. From this you can deduce the relative atomic mass of magnesium.
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Le Chatelier's principle: the effect of concentration on equilibrium
The reversible reaction between bismuth(III) oxychloride and bismuth(III) chloride is demonstrated in this experiment.
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Problem based practical activities
A collection of 10 practical activities where students apply their understanding of a concept to devise a solution to a ‘real-life’ scenario.
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The combustion of iron wool
Demonstrate a clear increase in mass as iron wool is heated in air on a simple ‘see-saw’ balance.
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A thermometric titration
The aim of this experiment is to measure the maximum temperature reached during the reaction between hydrochloric acid and sodium hydroxide solution. The volumes that have reacted at the highest temperature, represent the ‘end point’ of the titration.
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A microscale acid-base titration
In this experiment you will be using microscale titration apparatus to complete an acid-base neutralisation. The aim is to calculate the exact concentration of sodium hydroxide solution.
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Vintage titrations: tannin in wine
Determine the tannin concentration in the samples of wine and investigate the differences between red and white wine.
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Vintage titrations: sulfur dioxide concentrations in wine
Devise an analytical method to compare the amount of sulphur dioxide present in the samples of wine provided.
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Gas volume
Construct apparatus to measure the molar volume of hydrogen produced from the reaction of magnesium with vinegar.
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Franklin's teaspoon of oil
Find out what you can about the dimensions of a molecule of olive oil by making calculations using the information contained in the historical account of Franklin’s teaspoon of oil experiment
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Exhibition chemistry
Magic beakers
Declan Fleming shows you how to capture your students’ imaginations with spectacular demonstrations
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On This Day – Aug 08 : Henri Hess was born
He studied energy changes during chemical reactions, and postulated a method of predicting them – Hess’s Law. This is now routinely used by chemists to make predictions for enthalpy changes.
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CPD
Moles and titrations
Dorothy Warren describes some of the difficulties with teaching this topic and shows how you can help your students to master aspects of quantitative chemistry
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