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Practical Work — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryPractical Work2 Marks
Question
Using Sodium hydroxide solution, how would you distinguish: Zinc nitrate solution from calcium nitrate solution.
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Answer

Sodium hydroxide reacts with zinc nitrate and zinc hydroxide is formed which is soluble in excess of sodium hydroxide
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Zn \left( NO _3\right)_2( aq )+2 NaOH ( aq ) \longrightarrow Zn ( OH )_2( s )+2 NaNO _3( aq )
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Sodium hydroxide reacts with calcium nitrate and forms white ppt. of calcium hydroxide which is insoluble in excess of sodium hydroxide.
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Ca \left( NO _3\right)_2+2 NaOH \longrightarrow Ca ( OH )_2+2 NaNO _3
$

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