Question

if 250 ml of 0.25 molar NaCl solution is diluted with water to volume of 500 ml the new concentration of the solution is​

Answer 1

Answer:

Explanation:

Given:

Volume of the solution = 250 ml = 0.25 Liters

Molarity of solution = 0.25 Molar

By definition of Molarity,

Molarity = Number of moles/ volume of solution (in liter)

⇒ Number of moles of NaCl = Molarity x volume of solution (Liter)

                                               = 0.25 x 0.25

                                                = 0.0625 moles of NaCl

Note: On adding additional water, the volume of solution will change (due to which the concentration of solution changes) but number of moles of NaCl will remain same as we are not adding any additional NaCl.

Now,

Number of moles of NaCl = 0.0625 moles

Volume of solution after adding 500 ml of water = 250 ml + 500 ml

                                                                                 = 750 ml

                                                                                  = 0.75 liter

Hence, Molarity = Number of moles of NaCl/ Volume of solution

                           = 0.0625/0.75

                           = 0.083 M

Answer 2

Answer is here........