Question

A solution contains fluoride salts of calcium and magnesium; the concentrations of Ca$^{2+}$ is 0.050 M and Mg$^{2+}$ is 0.02 M. If the $K_{sp}$ of CaF$_2$ = 3.9 x 10$^{-11}$ and the one of $K_{sp}$ of MgF$_2$ = 6.5 x 10$^{-9}$ The dissociation reaction(s) in water for the compound that dissociates first is: CaF$_2$ (s) $ ightleftharpoons$ Ca$^{2+}$ (aq) + 2F$^-$ (aq) CaF$_2$ (s) $ ightleftharpoons$ Ca$^{2+}$ (aq) + F$^-$ (aq) MgF$_2$ (s) $ ightleftharpoons$ Mg$^{2+}$ (aq) + 2F$^-$ (aq) CaF$_2$ (s) + MgF$_2$ (s) $ ightleftharpoons$ Ca$^{2+}$ (aq) + Ca$^{2+}$ (aq) + 4F$^-$ (aq) MgF$_2$ (s) $ ightleftharpoons$ Mg$^{2+}$ (aq) + F$^-$ (aq)

          A solution contains fluoride salts of calcium and magnesium; the concentrations of Ca$^{2+}$ is 0.050 M and Mg$^{2+}$ is 0.02 M. If the $K_{sp}$ of CaF$_2$ = 3.9 x 10$^{-11}$ and the
one of $K_{sp}$ of MgF$_2$ = 6.5 x 10$^{-9}$
The dissociation reaction(s) in water for the compound that dissociates first is:
CaF$_2$ (s) $
ightleftharpoons$ Ca$^{2+}$ (aq) + 2F$^-$ (aq)
CaF$_2$ (s) $
ightleftharpoons$ Ca$^{2+}$ (aq) + F$^-$ (aq)
MgF$_2$ (s) $
ightleftharpoons$ Mg$^{2+}$ (aq) + 2F$^-$ (aq)
CaF$_2$ (s) + MgF$_2$ (s) $
ightleftharpoons$ Ca$^{2+}$ (aq) + Ca$^{2+}$ (aq) + 4F$^-$ (aq)
MgF$_2$ (s) $
ightleftharpoons$ Mg$^{2+}$ (aq) + F$^-$ (aq)

Show more…

A solution contains fluoride salts of calcium and magnesium; the concentrations of Ca^2+ is 0.050 M and Mg^2+ is 0.02 M. If the Ksp of CaF2 = 3.9 x 10^-11 and the
one of Ksp of MgF2 = 6.5 x 10^-9
The dissociation reaction(s) in water for the compound that dissociates first is:
CaF2 (s) ightleftharpoons Ca^2+ (aq) + 2F^- (aq)
CaF2 (s) ightleftharpoons Ca^2+ (aq) + F^- (aq)
MgF2 (s) ightleftharpoons Mg^2+ (aq) + 2F^- (aq)
CaF2 (s) + MgF2 (s) ightleftharpoons Ca^2+ (aq) + Ca^2+ (aq) + 4F^- (aq)
MgF2 (s) ightleftharpoons Mg^2+ (aq) + F^- (aq)

Added by Curtis S.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Oluwapelumi Kolawole

08/14/2023

Step 1

050)(2(0.050))^2 Q = 0.050 x 0.100 x 0.100 Q = 5.0 x 10^-4 Show more…

Show all steps

lock

Thanks for your feedback!

A solution contains fluoride salts of calcium and magnesium; the concentrations of Ca^(2+) is 0.050M and Mg^(2+) is 0.02M. If the K_(sp) of CaF_(2)=3.9 imes 10^(-11) and the one of K_(sp) of MgF_(2)=6.5 imes 10^(-9) The dissociation reaction(s) in water for the compound that dissociates first is: CaF_(2)(s)⇄Ca^(2+)(aq)+2F^(-)(aq) CaF_(2)(s)⇄Ca^(2+)(aq)+F^(-)(aq) MgF_(2)(s)⇄Mg^(2+)(aq)+2F^(-)(aq) CaF_(2)(s)+MgF_(2)(s)⇄Ca^(2+)(aq)+Ca^(2+)(aq)+4F^(-)(aq) MgF_(2)(s)⇄Mg^(2+)(aq)+F^(-)(aq) A solution contains fluoride salts of calcium and magnesium; the concentrations of Ca2+ is 0.050 M and Mg2* is 0.02 M. If the Ksp of CaF =3.9 x 10-11and the 0ne of Ksp of MgF2 = 6.5 x 10-9 The dissociation reaction(s) in water for the compound that dissociates first is: O CaF2(s) = Ca2* (aq) + 2F (aq) O CaF2(s)= Ca2*(aq) + F (aq) O MgF2(s) = Mg2+ (aq) + 2F (aq) O CaF(s) + MgF2 (s)Ca2+ (aq)+ Ca2+ (aq) + 4F (aq) O MgF2(s) Mg2+(aq) + F (aq)

Play audio

Feedback

Powered by NumerAI

Oluwapelumi Kolawole and 89 other subject Chemistry 101 educators are ready to help you.

Ask a new question

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Recommended Videos

Recommended Textbooks

Transcript

00:01 All right so we have a question on solubility here.

00:03 It says a solution of contains fluoride salt of calcium and magnesium.

00:09 The concentration of calcium is 0 .07 molar 0 .070 molar.

00:20 Let's just write that again 0 .070 molar while the concentration of magnesium ion is 0 .050 molar.

00:36 Right okay so the first question says we should write the dissociation reactions in water for both compounds.

00:49 Obviously we're also given the ksp.

00:50 We're given the ksp of calcium fluoride that is given to us as 6 that's 3 .9 times 10 to the power of minus 11 while that of magnesium fluoride is much smaller magnesium fluoride we have that to be 6 .5 times 10 to the power of minus 9.

01:18 Okay it's much bigger sorry not smaller.

01:21 Okay so the first question it says we should write the equation.

01:24 So this is the equation for the dissociation of both salts.

01:28 You have magnesium fluoride and two moles of fluoride ion while for calcium fluoride you have two moles of fluoride plus calcium.

01:41 It doesn't matter the order you write it just switch the dot.

01:45 The next one says which solution will dissolve first.

01:53 The solution that will dissolve first is the one with a higher ksp value because the higher the ksp value the more soluble that salt is.

02:01 That's what it means.

02:02 So magnesium fluoride will dissolve first...

Ace is your personal tutor. It breaks down any question with clear steps so you can learn.

Start Using Ace

Continue solving this problem

Create a free account to:

View full step-by-step solution
Ask follow-up questions with Ace AI
Save progress and study later