well i THINK heating the solution will speed up the reaction in the solution before adding the precipitate since the final observation required is the precipitation. you dont add the reagent before heating since it may give a false observation after heating, it might not precipitate normally but since you've otherwise it might.
BY : RAY LEE SEACREST
Why the NaOH is heated before adding in BaCl2 for determination of purity of NaOH sample?
Because evaporation is accelerated after increasing of the temperature.
By precipitation or evaporation of saturated solutions.
Two types of evaporation are solar evaporation, which occurs when water is heated by the sun, and mechanical evaporation, which involves the use of machines to heat water and accelerate the evaporation process.
It be evaporation. ~answered by FightingLucario
evaporation evaporation
evaporation
evaporation means when something gets heated and went in the sky.
Evaporation
Evaporation
Why the NaOH is heated before adding in BaCl2 for determination of purity of NaOH sample?
Yes, that is how evaporation occurs: when water is heated.
Because evaporation is accelerated after increasing of the temperature.
Evaporation occur at any temperature.
radiation
yes
because it is faster