need all CHE 131-52/53 Final Examination Fall 2017 97 correct formula for sulfur

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CHE 131-52/53 Final Examination Fall 2017 97 correct formula for sulfuric acid is __ - A) H2SOa B H2SO3 C. H2SO4 E. SO.2 98. What is the [OH1] of a solution with [H:011 2.0x 105 M? A. 2.0 x 10 B. 5.0×10-5 C. 5.0× 10.10 D. 1.0×10.14 E. 2.0× 1010 99. What is the pH of a solution with [H301] 1.0 x 109 M? A. 1.0 x 10-5 C. 5.0 E. 9.0 100. What is the pH of a solution with [OH ] 1.0 x 104 M? A. 10.0 B. -10.0 C. 4.0 E. 1.0 x 10-10 101. Write the correctly balanced equation for the complete neutralization of HaPOs with Ca(OH)2. A. H3PO4 + Ca(OH)2 B. 3 H3PO4+Ca(OH)2 C. H3PO4 + Ca(OH)2 D.2HsPO4 + 3 Ca(OH)2 E. 4H3POa +6 Ca(OH)2 CaHPOa + 2 H2O Cas(PO4)2 + 5 Hz Ca3(PO4)2+H2O Cas(PO4)2 + 6 H2O 2 Cas(PO4)2 +12H2O 102. The neutralization reaction between AI(OH)s and HNOs produces the salt with the formula A. H20 B. AINO3 C. AlH2 D. Al(NO3)3 E. NO3OH 18

Explanation / Answer

Q97

sulfuric acid = sulfur - S, "ic" most oxidized, SO4 ; acid implies H+ protons so H2SO4

Q98

Kw = [H3O+][OH-]

10^-14 = (2*10^-5)(OH-)

[OH-] = (10^-14)/ (2*10^-5) = 5*10^-10

Q99

pH = -log(H3O+) = -log(10^-9) = 9

Q100

pOH = -log(OH) = -log(10^-4) = 4

pH = 14-4 = 10

Q101

Ca(OH)2 + H3PO4 --> H2O + Ca3(PO4)2

ratio is 3:2 o

3Ca(OH)2 + 2H3PO4 --> H2O + Ca3(PO4)2

Q102

Al(OH)3 + HNO3 =

cation = Al+3

anion = NO3-

then

Al(NO3)3

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