CBSC Science

  Indicators :- • These are the substances which predict the solution acid or base by change its colour or odour . Types :- •Indicators are of two types:- 1) Natural indicators. 2) Synthetic indicators. 3) Olfactory indicators. 1) Natural indicators :- • These are indicators which are obtain from nature and predict the nature of solution. Example:- Litmus paper( it changes its colour in acidic and in basic solution), extract of hebiscus flower, red cabbage etc. 2) Synthetic indicators: - • These are the substances which are synthesised in lab or man mad indicators which predict the nature of solution by change in colour . Example :- phenolphthalein ( in acidic it's colourless and in basic its colour change to pink), Methylorange ( in acidic it's red and in basic its yellow) 3) Olfactory indicators :- These are the inductors which change its odour in acidic and in basic medium. Example:- Clove oil, Onion extract, vanilla etc. #Youtube chennel link :- https://youtu.be/LoIbygPU...

  Acids:- Acids are sour in taste. Acids contain H+ ions. Acids turns blue litmus paper to red. Example:- HCl, H2SO4, CH3COOH etc. Bases:- Bases are bitter in taste. Bases contain OH- ions. Bases turns red litmus paper to blue. Example:- NaOH, KOH, MgOH. Salts:- Salts are salty in taste. Salts doesn't contain H+ or OH- ions but when they desociate they gives A+ and B- ions. Example:- NaCl as Na+ , Cl- ions. Salts doesn't change in litmus paper( it remains same ). #Youtube chennel link :- https://youtu.be/LoIbygPUZPA