Answer to Question #347988 in General Chemistry for Dylan

Question

Saline solutions are used in hospitals to replace lost body fluids and electrolytes. A normal saline solution is made by dissolving 0.9 g NaCl in 100 mL of water. Calculate its concentration as % by mass

Answer 1

Since the density of water is 1 g / ml, the mass of 100 ml of water is equal to 100 gr: m = 100 ml * 1 gr / ml = 100 gr.

To find the percentage concentration of the solution, divide the mass of NaCl by the total mass of the solution and multiply by 100% :

$C_{percent} = \frac {0,9}{100+0,9}*100= 0,892 ≈ 0,9$

ANSWER: 0,9%