Question

What is the strength (expressed as a ratio) of a 30 millier solution that contains 300 milligrams of sodium chloride? O A. 3:30 B. 1:100 O C. 300:30 O D. 10.1 Click to select your answer and then click Check Answer All parts showing clear Ail arch 米

Answer 1

ANS: (D) 10:1

Solution concentration can be expressed as an amount strength in units of mg/100mL, mg/mL, g/100mL, g/L – and so on.

Though there are other methods, we can use proportional Sets to discover what the amount strength would be in terms of mg/mL or g/mL.

Sodium Chloride:	300mg	z
Water (mL) to:	30mL	1

Z represents the number of milligrams of sodium chloride in 1ml of water.

From the proportional sets above, we can see that z=10mg.

Given that 10mg of NaCl is in 1mL of solution, we represent this as 10mg/mL. This is the amount strength we are looking for.