Option Focus
1
) What are the family member focus of the ions in a remedy of liquid salt hydrogen sulfite?
( a) sup> = sup> = sub>2-<
( b) sup> = sup>
( c) sup> = sup> + sub>2-<
( d) sup> > sup> >> sup> = sub>2-<
2
) 15 mL of 0.10 M BaCl2 is blended with 35 mL of 0.10 M AgNO3. What are the focus of the ions in the last blend?
( a) sup> = 0.030 M, sup> = 0 M, sup> = 0 M, sup> = 0.070 M
( b) sup> = 0.030 M, sup> = 0 M, sup> = 0.010 M, sup> = 0.070 M
( c) sup> = 0.10 M, sup> = 0.10 M, sup> = 0 M, sup> = 0.10 M
( d) sup> = 0.10 M, sup> = 0.20 M, sup> = 0.10 M, sub>–< = 0.10 M
3
) What is the mass of the solute in 250. mL of 0.122 M potassium phosphate?
( a) 2.90 g
( b) 6.47 g
( c) 0.0305 g
( d) 25.9 g
( e) 435 g
4
) What is the mass of the solute in 1.5 L of 3.55 M calcium hydroxide?
( a) 213 g
( b) 5.33 g
( c) 31.3 g
( d) 263 g
( e) 395 g
.
5) The optimum focus of p-dichlorobenzene in alcohol consumption water that is enabled by the EPA is 0.075 mg/L. Express this as a mass percent. Presume the thickness of the water is 1.00 g/mL.
( a) 7.5 x 10-7 %
( b) 7.5 x 10-8 %
( c) 7.5 x 10-3 %
( d) 7.5 x 10-6 %
6
) What is the mass of the solute in 750. mL of 0.311 M potassium bromide?
( a) 287 g
( b) 9.12 g
( c) 27.8 g
( d) 37.0 g
( e) 233 g
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