Question

A solution is made by dissolving 811.0 cg of barium hydroxide, Ba(OH)2, in 0.1137 kg of water. What is the concentration in parts per million?

I know the equation is:
ppm= (mass of solute/mass of solution)10^6

Does the mass need to be in g or kg?

Answer 1

Convert 811 cg to kilograms

811.0 cg = 811.0/100 g = 8.110/1000 kg
=0.008110 kg
Then use formula to calculate concentration in ppm.
Keep the answer to 4 significant figures.

Answer 2

6. The solubility of salt 'A' in water at 60°C is 27.5 g. Find out how much of the same salt will dissolve in 75.5 g of water at 60°C (2 Marks)

Answer 3

[AI-generated answer — Explain Bot]

The mass in the equation for calculating parts per million (ppm) can be in either grams (g) or kilograms (kg). However, it is important to ensure that the mass units are consistently either in grams or kilograms throughout the equation to avoid any unit conversion errors. In the given question, you have the mass of water given in kilograms (kg), so it would be more convenient to use kilograms for the mass of solution.