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Litmus

What do you o...

Question

What do you observe when calcium is heated and then tested with moist blue and red litmus - paper?

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Solution

When calcium is heated, it reacts with oxygen to form calcium oxide. When calcium oxide reacts with water, it turns into calcium hydroxide, which is an alkali. So, it turns moist red litmus blue. There will be no effect on moist blue litmus paper.

$2 C a + O_{2} \to 2 C a O$

$C a O + H_{2} O \to C a (O H)_{2}$

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