Some properties of four solids, W, X, Y and Z, are shown in the table below.
| Property | Solid W | Solid X | Solid Y | Solid Z |
|---|---|---|---|---|
| Colour of solid | White | Green | Dark grey | White |
| Observation when added to water | Dissolves easily to form a colourless solution | Insoluble; green solid remains | Insoluble; dark grey solid remains | Partially dissolves to form a slightly cloudy mixture |
| pH of mixture with water | 14 | 7 | 7 | 12 |
| Observation when dilute hydrochloric acid is added | Reacts to form a colourless solution; no bubbles | Effervescence; solid disappears to form a blue-green solution | Effervescence; solid disappears to form a pale green solution | Reacts to form a colourless solution; no bubbles |
The solids, in no particular order, are calcium oxide, copper(II) carbonate, iron metal, and sodium hydroxide.
Identify solids W, X, Y and Z, explaining how the information in the table supports the identification of each solid.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
