State the temperature and pressure used for stage 2. Name the catalyst used in stage 2.
Write the chemical equation for the stage 3 reaction.
Name the substance that reacts with oleum in stage 4.
Name the black solid formed when concentrated sulfuric acid is added to sugar, $\text{C}_{12}\text{H}_{22}\text{O}_{11}$.
Calculate the volume of 0.0625 mol/dm$^3$ dilute sulfuric acid that will react completely with 25.0 cm$^3$ of 0.100 mol/dm$^3$ potassium hydroxide, KOH, to make aqueous potassium sulfate. Use the steps below.
Use your answer to c(i) together with the equation to work out the volume of $\text{H}_2\text{SO}_4$ needed.
A flame test is performed on aqueous potassium hydrogensulfate.
Solid copper(II) carbonate is introduced to aqueous potassium hydrogensulfate.
A solution containing aqueous barium ions, $\text{Ba}^{2+}(aq)$, is added to aqueous potassium hydrogensulfate.
Write the ionic equation for the reaction in d(iii), including state symbols.