Question

(1) By using moist blue litmus paper classify the following compounds given below as acids and bases
`Ca(OH)_(2), H_(2)SO_(4), CH_(3)COOH, NaOH, KOH, Mg(OH)_(2), HNO_(3), NH_(4)OH`
(2) Mention the acidic or basic or neutral nature of solutions by using
(a) litmus
(b) methyl orange
(c) phenolphthalein indicators.

Answer 1

(a) `{:("Compounds","Colour of blue litmus","Nature of substance"),(Ca(OH)_(2),"No changes","basic"),(H_(2)SO_(4),"change to red","acidic"),(CH_(3)COOH,"change to red","acidic"),(NaOH,"no change","basic"),(KOH,"no change","basic"),("Mg"(OH)_(2),"no change","basic"),(HNO_(3),"change to red","acidic"),(NH_(4)OH,"no change","basic"):}` ltBrgt (b) `{:("Indicators","Acidic","Basic","Neutral"),("Litmus","Red","Blue","No change in colour"),("Methyl orange","Yellow","Pink","No change"),("Phenolphthalein","Colourless","Pink","No change"):}`