8 gram NaOH ne pani ma ogali 250 mili dravan banavama avyu che.aa dravan ne 500 mili banavva pani umeri mand karvama ave che.aa mand dravan ma NaOH na mol ane molarity ketly hase?

 

Asked by nirdeshpatel2603 | 7th Aug, 2019, 01:35: AM

Expert Answer:

Que. 8 g NaOH is dissolved in 250 ml water.Calculate the number of moles of NaOH and molarity of the solution if solution is diluted to 500 ml.
 
Given:
 
Mass of NaOH = 8 gm
 
Volume of solution = 250 ml
 
Molar mass of NaOH = 40 g/mol
 
No. of moles of NaOH 
 
 equals space 8 over 40

equals space 0.2 space mol
 
Molarity of solution 
 
Molarity space equals fraction numerator No. space of space moles over denominator Volume space of space solution space in space straight L end fraction

space space space space space space space space space space space space space equals fraction numerator 0.2 over denominator 0.25 end fraction

Molarity space equals space 0.8 space straight M
 
When solution is diluted to 500 ml
 
Volume = 500 ml
 
Molarity is
 
equals fraction numerator 0.2 over denominator 0.5 end fraction

equals 0.4 space straight M
 
 

Answered by Varsha | 7th Aug, 2019, 10:02: AM