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Calculation of Strong Acid Reactance

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(1)

a. Calculation

Non Graphic method

Strong acid Formula :

CH3COOC2H5(aq) + H2O(l) HCl

→ CH3COOC2H5(aq)

5 45 50 = 100 ml

÷10

0,5 4,5 5 = 10 ml

n CH3COOC2H5 = M.CH3COOC2H5 x V.CH3COOHC2H5

= 2 M x 0,50 ml

= 1,00 mmol n HCl = M.HCl x V.HCl

= 0,5M x 5 ml

= 2,5 mmol

to → nNaOH = nCH3COOH M NaOH x V NaOH = 2,50 mmol 0,2M x V NaOH = 2,5 mmol

V NaOH = 12,5 ml

t∞ → nNaOH = nHClcatalyst + nCH3COOHproduct

M NaOH x V NaOH = 3 mmol V NaOH = 15 ml

t∞ → nNaOH = nHClcatalyst + nCH3COOHproduct

M NaOH x V NaOH = 2,5 mmol + 1,00 mmol 0,2M x V NaOH = 3,50 mmol

V NaOH = 17,5 ml Calculation of the CH3COOH that react :

(2)

Formula :

mol ek NaOH = mol ek CH3COOHcatalyst + mol ek CH3COOHproduct M NaOH . V NaOH = (M CH3COOH . V CH3COOHcatalyst) + X

a) 0,2 M . 14,3 ml = (0,5 M . 5 ml) + X 2,86 = 2,5 + X

2,86 – 2,5 = X 0,36 = X

b) 0,2 M . 14,5 ml = (0,5 M . 5 ml) + X 2,9 = 2,5 + X

2,9 – 2,5 = X 0,4 = X

c) 0,2 M . 14,7 ml = (0,5 M . 5 ml) + X 2,94 = 2,5 + X

2,94 – 2,5 = X 0,44 = X

d) 0,2 M . 14,8 ml = (0,5 M . 5 ml) + X 2,96 = 2,5 + X

2,96 – 2,5 = X 0,46 = X

e) 0,2 M . 15 ml = (0,5 M . 5 ml) + X 3,0 = 2,5 + X

3,0 – 2,5 = X 0,5 = X

f) 0,2 M . 15,2 ml = (0,5 M . 5 ml) + X 3,04 = 2,5 + X

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3,04 – 2,5 = X 0,54 = X

t a x a-x ln(a-x) a/(a-x)

300 1 0,36 0,64 -0,446287 1,5625

600 1 0,4 0,6 -0,5108256 1,6666

1200 1 0,44 0,56 -0,5798184 1,7857 1800 1 0,46 0,54 -0,6161861 1,8518

3000 1 0,5 0,5 -0,6931471 2

6000 1 0,54 0,46 -0,7765287 2,173

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 Reaction order 1

1/t a/(a-x) ln a/(a-x) k

0, 00333 1,5625 0,44628 1,48×10−3 0, 00166 1,6666 0,51078 8,4×10−4 0,000833 1,7857 0,57981 4,8×10−4 0,00055 1,8518 0,61616 3,3×10−4

0,0003333 2 0,69314 2,3×10−4

0,0001666 2,173 0,77610 1,3×10−4

 Reaction order 2

1/t 1/(a-x) 1/a (1/(a-x)-1/a) k 0, 00333 1,5625 1 0,5625 1,3 x10-4

0, 00166 1,6666 1 0,25 4,1 x10-4

0,000833 1,7857 1 0,35135 2,9 x10-4

0,00055 1,8518 1 0,5625 3,1 x10-4

0,0003333 2 1 0,78571 2,6 x10-4

0,0001666 2,173 1 1 1,6 x10-4

 Reaction order 3

1/t (a-x)2 2(a-x)2 1/2(a-x)2 a2 2a2 1/2a2 1/ 2(a- x)2-1/2a2

k

0, 00333 0,409 6

0,8192 1,2207 1 2 0,5 0,7207 2,3 x10-3

0, 00166 0,36 0,72 1,3888 1 2 0,5 0,8888 1,4 x10-3

0,000833 0,313 6

0,6272 1,5943 1 2 0,5 1,0943 9,1 x10-4

0,00055 0,219 6

0,5832 1,7146 1 2 0,5 1,2146 6,6 x10-4

0,000333 3

0,25 0,5 2 1 2 0,5 1,5 4,9 x10-4

0,000166 6

0,211 6

0,4232 2,3629 1 2 0,5 1,8629 x10-4

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Weak acid Formula :

CH3COOC2H5(aq) + H2O(l) CH3COOH

→ C2H5OH(l) + CH3COOH(aq)

n CH3COOC2H5 =M.CH3COOC2H5 x V.CH3COOHC2H5

= 2 M x 0,50 ml

= 1,00 mmol

n CH3COOH = M.CH3COOH x V.CH3COOH

= 0,5M x 5 ml

= 2,5 mmol

to → nNaOH = nCH3COOH M NaOH x V NaOH = 2,50 mmol 0,2M x V NaOH = 2,5 mmol

V NaOH = 12,5 ml

t∞ → nNaOH = nCH3COOHcatalyst + nCH3COOHproduct

M NaOH x V NaOH = 3 mmol V NaOH = 15 ml

t∞ → nNaOH = nCH3COOHcatalyst + nCH3COOHproduct

M NaOH x V NaOH = 2,5 mmol + 1,00 mmol 0,2M x V NaOH = 3,50 mmol

V NaOH = 17,5 ml

(6)

Calculation of the CH3COOH that react :

Formula :

mol ek NaOH = mol ek CH3COOHcatalyst + mol ek CH3COOHproduct M NaOH . V NaOH = (M CH3COOH . V CH3COOHcatalyst) + X

a) 0,2 M . 12,7 ml = (0,5 M . 5 ml) + X 2,54 = 2,5 + X

2,54 – 2,5 = X 0,04 = X

b) 0,2 M . 13,5 ml = (0,5 M . 5 ml) + X 2,7 = 2,5 + X

2,7 – 2,5 = X 0,2 = X

c) 0,2 M . 13,8 ml = (0,5 M . 5 ml) + X 2,76 = 2,5 + X

2,76 – 2,5 = X 0,26 = X

d) 0,2 M . 14,3 ml = (0,5 M . 5 ml) + X 2,86 = 2,5 + X

2,86 – 2,5 = X 0,36 = X

e) 0,2 M . 14,7 ml = (0,5 M . 5 ml) + X 2,94 = 2,5 + X

2,94 – 2,5 = X 0,44 = X

(7)

f) 0,2 M . 15 ml = (0,5 M . 5 ml) + X 3 = 2,5 + X

3 – 2,5 = X 0,5 = X

t a X a-x ln(a-x) a/(a-x)

300 1 0,004 0,96 -0,040821 1,0416

600 1 0.1 0,8 -0,223143 1,25

1200 1 0,26 0,74 -0, 301105 1,351 1800 1 0,36 0,64 -0,446287 1,5625 3000 1 0,44 0,56 -0,579818 1,785

6000 1 0,5 0,5 -0,693147 2

(8)

 Reaction order 1

1/t a/(a-x) ln a/(a-x) k

0, 00333 1, 0416 0,040757 0,000135

0, 00166 1,25 0,223143 0,00037

0,000833 1,351 0,300845 0,00025 0,00055 1,5625 0,446287 0,00024 0,0003333 1,785 0,579418 0,00019

0,0001666 2 0,6913 0,00011

 Reaction order 2

1/t 1/(a-x) 1/a (1/(a-x)-1/a) k 0, 00333 1, 04166 1 0,040166 1,3 x10-4

0, 00166 1,25 1 0,25 4,1 x10-4

0,000833 1,35135 1 0,35135 2,9 x10-4

0,00055 1,5625 1 0,5625 3,1 x10-4

0,0003333 1,78571 1 0,78571 2,6 x10-4

0,0001666 2 1 1 1,6 x10-4

 Reaction order 3

1/t (a-x)2 2(a-x)2 1/2(a-x)2 a2 2a2 1/2a2 1/ 2(a- x)2-1/2a2

k

0, 00333 0,921 6

1,8432 0,54253 1 2 0,5 0,0425 1,4 x10-4

0, 00166 0,64 1,28 0,78125 1 2 0,5 0,281523 4,6 x10-4

0,000833 0,547 6

1,0952 0,91307 1 2 0,5 0,41307 3,4 x10-4

0,00055 0,409 6

0,8192 1,2267 1 2 0,5 0,7267 3,9 x10-4

0,000333 3

0,313 6

0,6272 1,5943 1 2 0,5 1,0943 3,6 x10-4

0,000166 6

0,25 0,5 2 1 2 0,5 1,5 2,4 x10-4

Graphic method

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Weak acid

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Strong acid

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