Question

Carbon and Its
compounds
. How do you test the persence of carbon
dioxide in respiratory gases?​

Answer 1

Explanation:

carbon dioxide when passed through lime water, turns the lime water milky. this is the test for presence of carbon dioxide.

Answer 2

Answer:

1)  Carbon dioxide gas, CO2(g) has no colour or smell.

2)  Carbon dioxide gas will put out a lit splint.

3)  Carbon dioxide gas will turn moist litmus paper from blue to red,

and moist universal indicator paper to yellow.

Carbon dioxide dissolves in water to form carbonic acid (H2CO3).

Carbonic acid is a weak acid (see the carbon cycle).

Carbon dioxide will turn lime water 'milky' or cloudy.

Lime water is a solution of calcium hydroxide (slaked lime).

When carbon dioxide is bubbled through it,

a solid precipitate of calcium carbonate is formed.

Calcium carbonate is chalk or limestone,

and it is this that makes the lime water cloudy.