The table shows the names and formulae of three ions - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Question 6
The table shows the names and formulae of three ions.
name of ion | formula of ion
-------------|----------------
calcium | Ca²⁺
nitrate | NO₃⁻ ... show full transcript
Worked Solution & Example Answer:The table shows the names and formulae of three ions - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Step 1
What is the formula of calcium nitrate?
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Answer
To determine the formula of calcium nitrate, we first note that calcium forms a cation with a 2+ charge (Ca²⁺) and nitrate is an anion with a 1- charge (NO₃⁻). To achieve a neutral compound, we need two nitrate ions for every one calcium ion. Therefore, the formula for calcium nitrate is:
Ca(NO3)2
Thus, the answer is option D: Ca(NO₃)₂.
Step 2
The number of oxygen atoms in the formula Ca₃(PO₄)₂ is
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Answer
In the formula Ca₃(PO₄)₂, the phosphate ion (PO₄) has 4 oxygen atoms. Since there are 2 phosphate ions in the formula:
