Should a precipitation of Pb(IO3)2(s) form when 55.0 ml of 0.0450 M Pb(NO3)2 (aq) solution is added to 48.0 ml of 0.215 M NaIO3(aq) solution? Assume that at the temperature at which the experiment is performed, Ksp of Pb(IO3)2(s) is 2.8 x 10-13 . All work must be shown- a guess is not sufficient!

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27 Nov 2019

Should a precipitation of Pb(IO₃)₂(s) form when 55.0 ml of 0.0450 M Pb(NO₃)₂ (aq) solution is added to 48.0 ml of 0.215 M NaIO₃(aq) solution? Assume that at the temperature at which the experiment is performed, K_sp of Pb(IO₃)₂(s) is 2.8 x 10^-13 . All work must be shown- a guess is not sufficient!

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A solution is made up of

15.0 mL of 4.50 x 10^-3 M Fe(NO3)3

15.0 mL of 4.50 x 10^-3 M KSCN

10.0 mL of water

It is determined that the following reaction occurs

Fe3+ (aq) + SCN- (aq) = Fe(SCN)2+ (aq)

1. What is the concentration (in M) of Fe3+ in the resulting solution before any reaction takes place? Assume that volumes are addictive.

2. At equilibruim, [Fe(SCN)2+] is 1.20 x 10^-3 M. What is [Fe3+] at equilibrium?

3. What is K for the reaction at the temperature in which the experiment is performed?

A student performed this experiment by mixing 50.0 mL of 2.0 M NaOH solution with 50.0 mL of 2.0 M HCl solution.

A student obtained the following results from Part 2B of the lab:

	Mg(NO₃)₂
NaCl	NP
Na₂S	NP
NaOH	NP
Na₂CO₃	NP

X = precipitate form ; NP = no precipitate form

Did the student conduct the experiment correctly?

( may need to consult your result's table to help answer the question)

	A.	Yes, the student performed the experiment correctly.
	B.	No, the student mistakenly added Cu(NO₃)₂ solution instead of the Mg(NO₃)₂ solution.
	C.	No, the student mistakenly added AgNO₃ solution instead of the Mg(NO₃)₂ solution.
	D.	No, the student mistakenly added Fe(NO₃)₃ solution instead of the Mg(NO₃)₂ solution.
	E.	No, the student mistakenly added NaOH solution instead of the Mg(NO₃)₂ solution.

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