If you have 11.0 g of Ca(OH)2 dissolved in 173 mL, what is the % concentration (W/V)?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

The % concentration in term of w/v or weight by volume can be determined by dividing the amount of solute by volume of solvent and taking its percentage. In this case, the solute is calcium hydroxide or Ca(OH)2 and has a weight (or mass) of 11 gm. The volume of...

Unlock
This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Start your 48-Hour Free Trial

The % concentration in term of w/v or weight by volume can be determined by dividing the amount of solute by volume of solvent and taking its percentage. In this case, the solute is calcium hydroxide or Ca(OH)2 and has a weight (or mass) of 11 gm. The volume of the solvent is given as 173 ml.

Therefore, the concentration = mass of solute / volume of solvent   x 100 %

= 11 gm/ 173 ml  x 100% = 6.36% (w/v)

Thus, the given solution has a concentration of 6.36% (w/v).

We can similarly calculate the w/w concentration of the solution, by assuming the density of solvent (typically water) as 1 gm/ml.

% concentration  (w/w) = mass of solute / mass of solvent  x 100

= 11 gm / 173 gm x 100 = 6.36% (w/w)

Hope this helps.

Approved by eNotes Editorial Team