Question

page 62 Ex : Solutions and Sabilir and Mof a solution made by dissolving 0.40 g of K,SO, in water and diluting to a volume of 50.0 mL. 5. How many mL of a stock solution of 2.00 M solution of NaNO, are needed to make 1.50 L of a 0.100 M solution of NaNO,?

Answer 1

Date solution 0 7. myo mass of solute x 100 Volume of solution 0.40 x 100 = 0.80 %. - - 11 Molarity = no of moles of K₂ Soq Volume of soln (inh) = 0.00229 Luo of moles: 0.40g - 174 g mol Volume of solution: - 0.65 L 50 1ooo Mo 0.00229 -0.0458M 0.05 9 no. of millimoles remain constant M v . I Mi-2 1 ve ? M₂ V₂ M ² 0.100 v 2 1.5L m sor 2x v 0 1 x 1.5 V. 0025 L Volume of stock solution needed) 0.025 x 1000 225 ml