## Computing mass of CaF₂

Chemistry and homework help forum.

Organic Chemistry, Analytical Chemistry, Biochemistry, Physical Chemistry, Computational Chemistry, Theoretical Chemistry, High School Chemistry, Colledge Chemistry and University Chemistry Forum.

Share your chemistry ideas, discuss chemical problems, ask for help with scientific chemistry questions, inspire others by your chemistry vision!

Please feel free to start a scientific chemistry discussion here!

Discuss chemistry homework problems with experts!

Ask for help with chemical questions and help others with your chemistry knowledge!

Moderators: expert, ChenBeier, Xen

Dhamnekar Winod
Sr. Staff Member
Posts: 192
Joined: Sat Nov 21, 2020 10:14 am
Location: Mumbai[Bombay],Maharashtra State,India

### Computing mass of CaF₂

Calculate the mass of CaF2 produced when 5g of Ca(NO3)2 is mixed with 3g of NaF in water, with a final volume of 500 mL. Ksp is 3.5E-11 for the system.

My attempt to answer: Reaction equation is Ca(NO3)2 + 2NaF → CaF2 + 2NaNO3, we have 3.047e-2 moles of Calcium Nitrate and 7.145e-2 moles of Sodium Fluoride
How to proceed further?
Last edited by Dhamnekar Winod on Mon Jul 05, 2021 10:16 am, edited 1 time in total.
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
ChenBeier
Distinguished Member
Posts: 873
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Computing mass of CaF2

Check what is limiting agent.
Dhamnekar Winod
Sr. Staff Member
Posts: 192
Joined: Sat Nov 21, 2020 10:14 am
Location: Mumbai[Bombay],Maharashtra State,India

### Re: Computing mass of CaF₂

Mass of the CaF2 is 0.0304718 moles × 78.1 g(molar mass of CaF2 = 2.38 g.

I computed the solubility of CaF2 Calcium Fluoride in grams per liter in water from the Kₛₚ 3.5e-11 = 1.6 × 10⁻² g CaF2/L.

Molar solubility of CaF2 in 0.07145 M of NaF solution is 4.89E-10 M.