Question

20. Table salt (NaCl) was dissolved in water to produce 100 mL of a solution with a concentration of 2.5 g NaCl per mL of solution.
20a. How many grams of NaCl was used to prepare the solution? __________
20b. How many moles of NaCl are there in every mL of the solution? __________
20c. How many chloride ions are dissolved in the 100 mL solution? __________

Answer 1

Answer:

you dissolve 58.44g of NaCl in a final volume of 1 litre, you have made a 1M NaCl solution. To make a 0.1M NaCl solution, you could weigh 5.844g of NaCl and dissolve it in 1 litre of water; OR 0.5844g of NaCl in 100mL of water (see animation below); OR make a 1:10 dilution of a 1M sample.

Answer 2

Answer:

1k

Mass of solute i.e, for the sodium chloride =58.5g

Mass of solvent i.e, for the water=100g

Mass of solution=58.5+100=158.5g

The concentration of solution in terms of mass percentage is given as,

=58.5/158.5×100

= 36.9%