Chemistry
You have been provided with three test tubes. One of them contains distilled water and the other two have an acidic solution and a basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
Acids Bases Salts
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Answer
We take three pieces of red litmus paper. The solution which turns red litmus paper to blue is basic solution. Distilled water (neutral) and acidic solution will not effect red litmus paper.
Now we divide the so formed blue litmus paper into two pieces. The test tube containing distilled water does not change the colour of the blue litmus paper.
The test tube containing acidic solution changes the colour of the blue litmus paper to red. Hence, we can identify the three solutions.
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Related Questions
Name the ions furnished by:
(a) bases in solution
(b) an acid
Give one example in case:
(a) A basic oxide which is soluble in water,
(b) A hydroxide which is highly soluble in water,
(c) A basic oxide which is insoluble in water,
(d) A hydroxide which is insoluble in water,
(e) A weak mineral acid
(f) A base which is not an alkali
(g) An oxide which is a base,
(h) A hydrogen containing compound which is not an acid
(i) A base which does not contain a metal ion.
HCl, HNO3, C2H5OH, C6H12O6 all contain H atoms but only HCl and HNO3 show acidic character. Why?
(a) Dry HCl gas does not change the colour of dry litmus paper. Why?
(b) Is PbO2 a base or not? Comment.
(c) Do basic solutions also have H+(aq.) ? Explain why are they basic by taking an example?