Question

How many mL of 0.350M HClO4 must be added to 600.0 mL of 0.450M lithium cyanide (LiCN) to produce a pH = 9.50 buffer? The Ka hydrocyanic acid (HCN) is 6.2 × 10–10

A. 91.5 mL

B. 138 mL

C. 262 mL

D. 396 mL

Answer #1

A 150.0 mL buffer solution containing 0.100 M hydrocyanic acid
(HCN, Ka = 6.2 x 10-10) and 0.100 M potassium cyanide
(KCN) has 30.0 mL of 0.120 M KOH added to it. What is the pH of the
solution after the KOH has been added
a. 8.73 b. 9.00 c. 9.21 d. 9.29 e. 9.42

How many grams of solid potassium cyanide should be added to
1.00 L of a 0.239 M hydrocyanic acid solution to prepare a buffer
with a pH of 10.174 ?
grams potassium cyanide=

PART A
How many grams of solid sodium
cyanide should be added to 0.500
L of a 0.135 M hydrocyanic acid
solution to prepare a buffer with a pH of 8.597
?
grams sodium cyanide = _________
g.
PART B
How many grams of solid potassium
fluoride should be added to 0.500
L of a 8.48×10-2M hydrofluoric
acid solution to prepare a buffer with a pH
of3.807 ?
grams potassium fluoride =
________ g.
PART C
How many grams of...

How many mL of 0.200 M NaOH must be added to 31.35 mL of a
0.0500 F solution of fumaric acid (trans-butenedioic acid) to make
a buffer of pH 4.50?

How many mL of 0.200 M NaOH must be added to 31.35 mL of a
0.0500 F solution of fumaric acid (trans-butenedioic acid) to make
a buffer of pH 4.50?

How many grams of sodium acetate must be added to a 150.0 mL
solution of 0.40 M acetic acid to prepare a buffer with a pH =
4.80?

Consider the titration of 40.0 mL 2.00M hydrocyanic acid (HCN,
Ka = 4.9 x 10-10) with 4.00M potassium
hydroxide.
a) calculate the volume of base needed to neutralize this
acid
b)what is the pH of the acid solution before any base is added?
(weak acid problem, use approximate solution)
c) what is the pH of the solution after half of the acid is
neutralized? (buffer problem)
d) what is the pH of the solution after all the acid is
neutralized,...

How many grams of dipotassium phthalate (242.3 g/mol) must be
added to 200 mL of 0.150 M potassium hydrogen phthalate to give a
buffer of pH 5.40? The Ka's for phthalic acid are 1.12 x 10-3 and
3.90 x 10-6.

How many moles of sodium acetate must be added to 500.0 mL of
0.250 M acetic acid solution to produce a solution with a pH of
4.94? (The pKa of acetic acid is 4.74)
A) 0.011 moles
B) 0.021 moles
C) 0.13 mol
D) 0.20 mol
E) 0.21 mol

Given 15.75 mL of 0.230 M formic acid, HCOOH:
a) How many milliliters of 0.450 M potassium formate,
KCO2H, must be added to produce a buffer with pH
3.95?
b) How many milliliters of 0.450 M KOH must be added to produce a
buffer with pH 3.95?

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