How many grapms of AgNO3 should be dissolved in 20mL H2O to make a 1.0m M AgNO3 solution? Thanks

1 Answer
May 13, 2018

#"3.397 mg"#

Explanation:

Molarity is

#"Molarity" = "Moles of solute"/"Volume of solution (in litres)"#

#1.0 × 10^-3\ "M" = "n"/"0.02 L"#

#"n" = 1.0 × 10^-3\ "M" × 0.02\ "L" = 2 × 10^-5\ "mol"#

So, #2 × 10^-5\ "mol"# of #"AgNO"_3# is required.
Molar mass of #"AgNO"_3# is #"169.87 g/mol"#

Mass of #"AgNO"_3# required is
#2 × 10^-5 cancel"mol" × 169.87\ "g"/cancel"mol" = 3.397 × 10^-3\ "g = 3.397 mg"#