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Topic: Ksp 2  (Read 7505 times)

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Offline haber101

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Ksp 2
« on: March 31, 2010, 04:53:24 PM »
Calculate the Ksp for the salt SrF2 whose solubility is 12.2 mg/100 mL

simply don't know where to start any help is appreciated
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Offline Borek

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Re: Ksp 2
« Reply #1 on: March 31, 2010, 05:34:53 PM »
Please read forum rules.

Can you write Ksp formula?

Can you use solubility to calculate molar concentration?
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Offline haber101

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Re: Ksp 2
« Reply #2 on: March 31, 2010, 05:48:48 PM »
Quote from: Borek on March 31, 2010, 05:34:53 PM
Please read forum rules.

Can you write Ksp formula?

Can you use solubility to calculate molar concentration?

the Ksp formula: Ksp=[Sr^2+][F2^-]

i'm sure you can, but i'm not sure how
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Offline Borek

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Re: Ksp 2
« Reply #3 on: March 31, 2010, 06:19:38 PM »
Quote from: haber101 on March 31, 2010, 05:48:48 PM
the Ksp formula: Ksp=[Sr^2+][F2^-]

No. What is F2-? Also powers are wrong.

Quote from: haber101 on March 31, 2010, 05:48:48 PM
i'm sure you can, but i'm not sure how

I can, but I was asking if you can. If you don't - feel free to sue your school, they failed to teach you one of the most basic things in chemistry. And judging from what you wrote above, at present they are failing to teach you about Ksp.

How many moles of SrF2 in 100 mL?
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Offline haber101

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Re: Ksp 2
« Reply #4 on: March 31, 2010, 06:30:08 PM »
Quote from: Borek on March 31, 2010, 06:19:38 PM
Quote from: haber101 on March 31, 2010, 05:48:48 PM
the Ksp formula: Ksp=[Sr^2+][F2^-]

No. What is F2-? Also powers are wrong.

Quote from: haber101 on March 31, 2010, 05:48:48 PM
i'm sure you can, but i'm not sure how

I can, but I was asking if you can. If you don't - feel free to sue your school, they failed to teach you one of the most basic things in chemistry. And judging from what you wrote above, at present they are failing to teach you about Ksp.

How many moles of SrF2 in 100 mL?

Ksp=[Sr^2+][F-]^2
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Offline cliverlong

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Re: Ksp 2
« Reply #5 on: April 01, 2010, 02:53:20 AM »
Quote from: haber101 on March 31, 2010, 06:30:08 PM

Ksp=[Sr^2+][F-]^2
Please use the "sup" and "sub" buttons provided in the forum editor when writing such things.

Ksp=[Sr2+][F-]2

Using the ^ makes it fantastically difficult to sort out what is the "charge multiplier" on an ion and which is a power of a concentration term - and is completely unnecessary with a few seconds formatting effort.

You keep posting questions about Ksp. Please summarise what you know so far. Where are your equlibrium equations?

clive
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Offline haber101

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Re: Ksp 2
« Reply #6 on: April 04, 2010, 07:45:34 PM »
i get 12.2mg/100ml x 1000mL/1L x 1mol/125.62g = 9.7x10^-4

correct?
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Offline Borek

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Re: Ksp 2
« Reply #7 on: April 05, 2010, 04:33:49 AM »
That's OK, but that's intermediate result, not the final one.
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Offline haber101

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Re: Ksp 2
« Reply #8 on: April 05, 2010, 12:30:25 PM »
so how do i get the final result then? square it?
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Offline Borek

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Re: Ksp 2
« Reply #9 on: April 05, 2010, 03:29:07 PM »
Stop guessing.

What have you calculated?

What do you need to calculate Ksp?

How are things you need related to thing you have calculated?
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Offline haber101

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Re: Ksp 2
« Reply #10 on: April 05, 2010, 03:33:36 PM »
Quote from: Borek on April 05, 2010, 03:29:07 PM
Stop guessing.

What have you calculated?

What do you need to calculate Ksp?

How are things you need related to thing you have calculated?

alright so i simply plug into

Ksp=[Sr][2F]^2

i get 3.66x10^-9

good?
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