An excess of Calcium nitrate (NO3) was added to 50.0 mL of sodium fluoride, NaF, solution. The mass of the calcium fluoride precipitate, CaF2, produced was 2.93 g. What is the concentration of the Sodium Fluoride solution?
Ca(NO3)(aq) + 2 NaF(aq) ---> CaF2(s) + 2 NaNO3(aq)
my solution...
i got the concentration to equal 1.5 mol/L....correct? and if not please tell me whats right?
2006-07-14 09:38:48 · 10 answers · asked by nba_joker 1 in Science & Mathematics ➔ Chemistry
NaF has a m.w. of 42; CaF2 has a m.w. of 78.
2.93 g of CaF2 are 0.0376 moles, coming from (according to the reaction stoichiometry) 0.0752 moles of NaF, contained in 50 ml. This means that the concentration of the NaF solution, in M/l, is 1.5. You were correct!!!
2006-07-14 09:55:09 · answer #1 · answered by ascaniosobrero 3 · 0⤊ 0⤋
Congrajulations! you got the right answer.
NAF is the limiting reactant. Hence, when you do the stoichiometry, 3.16 gms of NAF is needed to produce CaF2. Find the moles of NAF which is 0.075 and dividing this by the its volume(50.0 ml) gives you 1.5 mol/L= 1.5 M NaF solution.
2006-07-14 09:58:13 · answer #2 · answered by haroun i 2 · 0⤊ 0⤋
To arrive at the concentration, calculate for the # of moles of CaF2, multiply the # of moles of CaF2 by 2 to get the moles of F. Divide this number by 50 x 10^-3 liters to get the concentration.
Your answer should be about 1.5011 mol / liter.
2006-07-14 09:57:31 · answer #3 · answered by AHQ 2 · 0⤊ 0⤋
turn your cellular telephone off and positioned it able which you recognize you will no longer circulate to on an identical time as you're analyzing. you will ultimately forget approximately approximately it until eventually you're performed analyzing. except you analyzing includes the internet, don't get on the pc except you may sort some thing. this could be tougher, yet forget approximately concerning to the certainty that there are websitres around. you're boyfriend would be there on the top of your analyzing. evaluate it an incentive for your self to chat to him once you're finished analyzing. this way, while he you seek advice from him you do no longer could hardship approximately all the analyzing you may have once you men dangle out. once you're leaving classification, evaluate all the lecture notes you had for the day. Then, day after in the present day study the recent ones and examine out to jot down a catalogue of all the failings from the previous lecture which you would be able to remember. Then, seem and see what number stuff you remember. proceed staring in any respect your previous notes and new notes until eventually the day of your try. additionally, do no longer forget approximately that analyzing continuously for hours substitute into inaffective in the top. provide your self a 15 minute smash between each hour. This includes strolling around the abode. Getting some thing to drink, or consume. and stretching out your physique. be sure you're able the place you could focus. do no longer enable something distract you. solid success!
2016-10-07 22:26:35 · answer #4 · answered by greenwell 4 · 0⤊ 0⤋
I've already answered this question in detail to "Reshaud_H"
http://answers.yahoo.com/question/index;_ylt=AjohVoZ0osS2DwdpDCYzM4nsy6IX?qid=20060713224051AA7Vwpn
Giving you the benefit of the doubt, go to that link to see the answer.
However, since most probably you just switched nicknames and try to double-check the solution I must say I am quite disappointed. I tried to be as clear, simple and detailed as possible.
If you don't want to bother to understand and learn the basics there is no point for us to help you.
Some of us are trying to help students understand and learn. Our aim is not to help you cheat. One asker had the nerve to say that cheating is the only way to success and whoever claims that he/she has achieved something wthout cheating is lying.
For the information of such ignorant and immature people, lots of people (including myself) have never cheated, studied because we like science and since we have some knowledge we can create new as well. Cheaters are parasites which can never produce anything good since they have no clue how to do it.
2006-07-14 22:02:19 · answer #5 · answered by bellerophon 6 · 0⤊ 0⤋
Looks good to me. Using rough figures, 2.93 g of CaF2 is 0.038 moles so that is 0.076 moles of F (and also NaF) in 50 mL. Multiply to reach 1000mL and you get your answer.
2006-07-14 09:57:45 · answer #6 · answered by ebk1974 3 · 0⤊ 0⤋
uhhh did you try cutting it with water? or you could always stick your finger in a taste it.
Hmmm.... Calcium Nitrate... my favorite
2006-07-14 09:44:47 · answer #7 · answered by Anonymous · 0⤊ 0⤋
You did not get that answers by yourself fool one of your responder to your question did .You are just trying to concurred the answer he gave to you loser.
2006-07-14 11:26:39 · answer #8 · answered by bige1236 4 · 0⤊ 0⤋
o...m...g...!! i didnt understand a single thing you said but if i could i would probably say the same thing as you did
2006-07-14 09:44:46 · answer #9 · answered by Anonymous · 0⤊ 0⤋
oh goodness i failed chemistry class... i wish you the best of luck, though! sorry i couldnt help!
2006-07-14 09:41:05 · answer #10 · answered by rumilb 4 · 0⤊ 0⤋