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Chemical Analysis Activity Sheet One – Introduction/Revision

 

Question 1

Indicate how many significant figures there are in:

a) 0.3050 b) 0.003050 c) 1.003 × 104

 

Question 2

Round each number as indicated:

a) 5.124 8 to 4 significant figures d) 0.135 237 1 to 4 significant figures

b) 5.124 4 to 4 significant figures e) 1.525 to 3 significant figures

c) 5.124 5 to 4 significant figures f) 1.525 007 to 3 significant figures

 

Question 3

Write each answer with the correct number of digits:

a) 3.021 + 8.99 =

d) 0.0302 ÷ (2.1143 × 10-3) =

b) 12.7 1.83 =

e) log (2.2 × 10-18) =

g) 10-4.555 =

c) 6.345 × 2.2 =

f) antilog (2.224) =

 

Question 4

Find the absolute and percent relative uncertainty and express each answer with a reasonable

number of significant figures.

a) 3.4 (±0.2) + 2.6 (±0.1) =

b) [3.4 (±0.2) × 10-8] ÷ [2.6 (±0.1) × 103] =

c) 3.4 (±0.2) ÷ 2.6 (±0.1) =

d) [3.4 (±0.2) 2.6 (±0.1)] × 3.4 (±0.2) =

 

Question 5

a) A solution is prepared by dissolving 0.2222 (±0.0002) g of KIO3 [FM 214.0010 ±0.0009] in 50.00 (±0.05) mL. Find the molarity and its uncertainty with an appropriate number of significant figures.

 

b) Would the answer be affected significantly if the reagent were only 99.9% pure?

Question 6

Calculate the pH of a) 5.0 × 10-4 M HNO3 and b) 5.0 × 10-4 M (CH3)4N+OH-.

 

Question 7

Using activity coefficients correctly, calculate the pH of

a) 0.050 M HBr

b) 0.050 M NaOH

 

Question 8

Find the pH and fraction of dissociation (α) of a 0.010 0 M solution of the weak acid HA with

Ka = 1.00 × 10-4.

 

Question 9

A 0.100 M solution of the weak acid HA has a pH of 2.36. Calculate pKa for HA.

 

Question 10

Calculate the concentration of Tl+ in a saturated solution of TlBr in water (Ksp = 3.7 x 10-9). Include activity effects.

 

a)       Calculate the concentration of Tl+ in a saturated solution of TlBr in 0.9 % w/v NaCl solution. Include activity effects.

 

b)       Comment on the difference between you answers to a) and b) above.

 

 

 

Chemical Analysis

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