Question

26. The molarity of 20 % w/v of Ca​

Answer 1

Answer:

20%w/v of ca = 20 gm Ca in 100 ml of soln.

so, no. of moles of ca= given mass/molar mass

= 20/20 = 1 mole

so molarity(M)= no. of moles of solute/volume of soln(in Litre)

so, given vol= 100 ml = 100/1000= 0.1 L

M= 1/0.1= 10