1. Fizzies were popular in the ‘60s & ‘70s They were “instant fizz” tablets sold by the Emerson Drug Company in the US who also made “Bromo Seltzer” headache remedy. They work by the reaction of an acid and a base. Today we’re going to try making some but for the best taste, you have to get the ratio just right! Fizzies were popular in the ‘60s & ‘70s They were “instant fizz” tablets sold by the Emerson Drug Company in the US who also made “Bromo Seltzer” headache remedy. They work by the reaction of an acid and a base. Today we’re going to try making some but for the best taste, you have to get the ratio just right! H 3 C 6 H 5 O 7 + 3NaHCO 3  Na 3 C 6 H 5 O 7 + 3H 2 O + 3CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide H 3 C 6 H 5 O 7 + 3NaHCO 3  Na 3 C 6 H 5 O 7 + 3H 2 O + 3CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide balance the equation H 3 C 6 H 5 O 7 + NaHCO 3  Na 3 C 6 H 5 O 7 + H 2 O + CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide H 3 C 6 H 5 O 7 + NaHCO 3  Na 3 C 6 H 5 O 7 + H 2 O + CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide Click to reveal192 g/mol84 g/mol calculate the formula mass of each of the two reactants

2. H 3 C 6 H 5 O 7 + 3NaHCO 3  Na 3 C 6 H 5 O 7 + 3H 2 O + 3CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide H 3 C 6 H 5 O 7 + 3NaHCO 3  Na 3 C 6 H 5 O 7 + 3H 2 O + 3CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide In a plastic disposable cup measure out … ½ a centimetre of juice concentrate a level table spoon of icing sugar up to 1g of NaHCO 3 half a cup of water dissolve everything measure out in a separate cake case up to 1g of citric acid then add to your drink, stir + taste In a plastic disposable cup measure out … ½ a centimetre of juice concentrate a level table spoon of icing sugar up to 1g of NaHCO 3 half a cup of water dissolve everything measure out in a separate cake case up to 1g of citric acid then add to your drink, stir + taste First we will make the drink without considering the “stoichiometry” is your drink too sour? too chalky?.. or just right? The only way to get it right every time is to add the chemicals in the right ratio is your drink too sour? too chalky?.. or just right? The only way to get it right every time is to add the chemicals in the right ratio

3. H 3 C 6 H 5 O 7 + 3NaHCO 3  Na 3 C 6 H 5 O 7 + 3H 2 O + 3CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide H 3 C 6 H 5 O 7 + 3NaHCO 3  Na 3 C 6 H 5 O 7 + 3H 2 O + 3CO 2 citric acid + sodium hydrogen carbonate  sodium citrate + water + carbon dioxide We’ll add 0.5g of NaHCO 3. How many moles do you have in 0.5g? How many moles of citric acid will react with one mole of NaHCO 3 ? (look at the ratio in the chemical equation) So how many moles of citric acid will you need to add? Calculate the mass of citric acid to add … We’ll add 0.5g of NaHCO 3. How many moles do you have in 0.5g? How many moles of citric acid will react with one mole of NaHCO 3 ? (look at the ratio in the chemical equation) So how many moles of citric acid will you need to add? Calculate the mass of citric acid to add … Let’s work out the ideal ratio for the acid and base to mix in so neither is left over … Check your answer with me before making up your second fizzy drink mix to see if it is any tastier 192 g/mol84 g/mol 0.5/84 = 0.00595 moles 1/3 rd of a mole 0.00595/3 = 0.00198 moles 0.00198 moles x 192 g/mol = 0.38g