What is the molarity of #NO_3^-# in each solution?

0.150 M #KNO_3#
0.150 M #Al(NO_3)_3#

Answer 1

For #"potassium nitrate"#, clearly #[NO_3^-]=0.150*mol*L^-1#........

For #"aluminum nitrate"#, clearly #[NO_3^-]=3xx0.150*mol*L^-1=0.450*mol*L^-1#........because #"aluminum nitrate"# ionizes to give 3 equiv of nitrate anion.

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Answer 2

Naomi Aronson

Additional information about the specific solution or concentration of the NO3- ion is needed to determine its molarity.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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What is the molarity of #NO_3^-# in each solution?

0.150 M #KNO_3# 0.150 M #Al(NO_3)_3#

0.150 M #KNO_3#
0.150 M #Al(NO_3)_3#