Sunday
December 8, 2013

# Posts by Jenni

Total # Posts: 78

math
A box contains two black balls and three gold balls. Two balls are randomly drawn in succession from the box. a. If there is no replacement, what is the probability that both balls are black? b. If there is replacement before the second draw, what is the probability that both ...

Chemistry!
Determine the pH of the following, giving your answers to two decimal places. I don't know how to do these problems =( a. 0.100 M ammonia b. 0.11 M oxalic acid. Assume that dissociation resulting from Ka2 is negligible relative to that from Ka1

Chemistry!!
Determine the pH of 0.100 M aqueous HCN to two decimal places, and determine hte concentration of CN- at equlibrium to two singificant figures. Can you show me all the steps to this question? Please and thank you!

Chemistry!
10.2 g of Pb(NO3)2 are dissolved in 100 mL of water, and added to 250.0 mL of a 0.250 M solution of KI. Determine the mass in grams of Pbl2 produced, and find the number of moles of the excess reagent. PLZ explain chemistry - DrBob222, Monday, December 13, 2010 at 4:30pm .......

chemistry
thanks!

chemistry
Posted by Jenni on Monday, December 13, 2010 at 3:32pm. Determine the molarity of nitrate ions in a solution prepared by mixing 25.0 mL of 0.50 M Fe(NO3)3 and 35.0 mL of 1.00 M Mg(NO3)2 Please explain fully do not know where to start? chemistry - DrBob222, Monday, December 13,...

CHEMISTY ...still getting it wrong, can you look again plz
6.21g/142.042 = 0.0437 2.97g/84.994 = 0.3494 M=moles/L 0.0437+0.3494/350.0= 1.12x10^-03 So I got = 1.12x10^-03 but my book says [Na+]= 0.350M Where did I go wrong?

CHEMISTY
Determine the molarity of sodium cations in solution when 6.21 g of sodium sulflate are mixed with 2.97 g of sodium nitrate in pure water to produce 350.0 mL of solution.......please explain every step. thanks!

chemistry........help!! =)
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

chemistry
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

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