General Chemistry Answers

will magnesium carbonate react with salicylic acid to form magnesium salicylate?...and why does the carbonate "darken" the solution?

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3. A sample of Al2(SO4)3 weighing 7.52-g was dissolved in enough water

and diluted to 250.0-mL. 100.0-mL of the dilution was transferred to

another flask, 10.0-mL of 0.050M EDTA, 20-mL of buffer solution, 50-mL of

alcohol and 2.0-mL dithizone TS were added. The resulting solution

required 8.7-mL of 0.031M ZnSO4 to reach the endpoint. (Note: Each mL

of 0.050M EDTA is equivalent to 16.66-mg Al2(SO4)3·18H20). Compute for

the percent purity of the sample.

Molar Mass: Al2(SO4)3·18H2O = 666.5

answer: 2.5% Al2(SO4)3

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2. A 50.0-mL water sample was determined for hardness in terms of

CaCO3. It required 40.0-mL of 0.0100M EDTA solution for titration.

Calculate the total hardness in parts per million (ppm) CaCO3.

Molar Mass: CaCO3 = 100.1

Answer: 8.01 x 102 ppm

CaCO3

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1. The silver ion in a 25.00-mL sample was converted to dicyanoargentate

(l) ion by the addition of an excess solution containing Ni(CN) 4

-2:

Ni(CN)4

-2 + 2 Ag+1 2Ag(CN)2

-1 + Ni+2

The liberated nickel ion was titrated with 43.77-mL of 0.02408M EDTA.

Calculate the molar concentration of the silver solution.

Molar Masses: Ni = 58.69 Ag = 107.9

answer: 0.08432M Ag+1

Calculate % composition of AlCl3.

Please show all work

Aluminum solid is added to aqueous hydrochloric acid à aqueous aluminum chloride and hydrogen gas

a) What is the greatest amount of hydrogen sulfide that you could make? You must find the limiting reactant

b) Which is the limiting reactant? 

Please show all work thank you

Li2CO3 (s)  +  2HCl (g)  à   H2O (l) +  CO2 (g)  +  2LiCl (aq)  If you combine 5.58 g of lithium carbonate with 0.220 moles of hydrogen chloride,

a)Which is the limiting reactant? 

b) Which is the excess reactant?

  Please show work for everything Thank you

3K2S (s)  +  2H3PO4 (aq)  = 3H2S (g)  +  2K3PO4 (aq) How many moles of K2S are needed to completely react with 21.1 mL of 1.50 M H3PO4?

BaO (s)  +  H2O (g) =   Ba(OH)2 (s)  If you used 2.34 mole of BaO(s), theoretically how many grams of Ba(OH)2 could be produced?

BaO (s)  +  H2O (g) = Ba(OH)2 (s)  If you want to completely react 10.25 g of barium oxide, how many grams of water will you need?