Tag: neutralisations in everyday life

Plants can neither grow in too acidic conditions nor grow in too basic conditions. Thus for the proper growth of the plant optimum pH of the soil has to be maintained.

$ N _{1}V _{1} (Na _{2}CO _{3}) = N _{2}V _{2} (A)$
$ N _{1}V _{1} (Na _{2}CO _{3}) = N _{2}V _{2}(B)$
$ N _{1} = 1 , V _{1} = 26ml, V _{2} = 10ml, V _{3} = 40ml$
Normality of A
$ N _{2} = \dfrac{N _{1}V _{1}}{V _{2}} = \dfrac{1 \times 26}{10} = 2.6 N $
Normality of B
$ N _{3}= \dfrac{N _{1}V _{1}}{V _{3}} = \dfrac{1 \times 26}{40} = 0.65 N $
if we mix A & B then
$ N _{1}V _{1} + N _{2} V _{2} = N _{3} (V _{1}+V _{2})$
$ 2.6 V _{1}+0.65V _{2} = 1 \times 1000 $
$ 2.6V _{1}+ V _{2} + 0.65 V _{2} = 1000 ...(1)$
$ V _{1}+V _{2} =1000 ...(2)$
multiply $eq^{n}$ (2) by 0.65 
$ 0.65 V _{1}+0.65V _{2} = 650 ...(3)$
$ V _{2} = 820.6 ml$
$ V _{1} = 1000 - 820.6 = 179.4 ml $
option "a" correct.

$ KMnO _{4}+KNO _{2}$
$ 0.18 N $ 25 ml
V = ? 0.21 N
we know $ N _{1}V _{1}= N _{2}V _{2}$
$ 0.18 \times V _{1} = 0.21 \times 25 $
$ V _{1} = \dfrac{0.21 \times 25}{0.18 }$
$ \boxed{V _{1} = 29.17 ml}$
Answer option C

Indigestion can lead to a feeling of fullness, burping, heartburn (due to gastric acid reflux), etc. Thus an antacid can neutralize the effect of an excess of acid and hence it can be consumed for some relief from heartburn, indigestion, acidity, etc.

Calcium hydroxide called slaked lime is an inorganic compound. It is a colorless crystal and is obtained when calcium oxide is mixed with water. It is used in preparation of dry mixes for painting and white washing.

Caustic soda is sodium hydroxide which is a strong base and so it has high basicity value on $pH$ scale. It is widely used in acid-base titrations to neutralize various strong or weak acids like sulfuric acid.

Acetic acid is a food additive. It is added to adjust pH and acts as a pickling agent for vegetables.

Wasp sting has basic venom. So an acid could be used to treat it.

Soda water is carbonated water. It contains water into which carbon dioxide gas under pressure has been dissolved. It is carbonic acid. The vast majority of carbonated water is sold in drink bottles as soft drinks and beverages.