Name the negative ion with the greatest concentration.
Name the compound formed from only $\text{NH}_4^+$ and $\text{SO}_4^{2-}$ ions.
Calculate the mass of hydrogencarbonate ions present in $200\,\text{cm}^3$ of river water.
Give a test for sodium ions. State the test and the observations.
Most nitrate ions in river water originate from fertilisers applied to fields. Describe the advantage of using fertilisers.
Water from natural sources can become contaminated with harmful substances. State why sewage and phosphates in river water are harmful.
Draw the displayed formula for ethanoic acid.
Ethanoic acid reacts with sodium hydroxide. Complete the word equation for this reaction. ethanoic acid + sodium hydroxide → [BLANK] + [BLANK]
Complete Table 2.2 so that the relative molecular mass of $\text{C}_5\text{H}_{10}\text{O}_2$ can be calculated.