How many grams of #KI# must be dissolved in 250.0 mL of solution to form a 0.075 M solution?

1 Answer
anor277
May 28, 2016

Approx. #3*g#

Explanation:

#"Concentration "="Moles"/"Volume"#

Here we are given the volume and the concentration and can thus find the molar quantity, and from this we find the mass of #KI#.

#"Moles "=0.075*mol*cancel(L^-1)xx250.0xx10^-3cancelL#
#=# #1.875xx10^-3*mol#.

#"Mass"# #=# #"moles"xx"molar mass"#

#=# #1.875xx10^-3*cancel(mol)xx166.0*g*cancel(mol^-1)# #~=3*g#

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