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Doss [256]
3 years ago
13

A solution of KMnO4 has an absorbance of 0.539 when measured in the colorimeter. Determine the concentration of the KMnO4 given

the following data for a calibration plot.
Concentration of KMNO4 (M) Absorbance
0.0150 0.081
0.0300 0.159
0.0450 0.260
0.0600 0.334
Chemistry
1 answer:
loris [4]3 years ago
6 0

Answer:

Concentration of unknown solution is 0.0416 M

Explanation:

As we know  

Absorbance is equal to the product of molar absorptivity of KMnO4 m, path length and concentration

From the given set of graphical data, it is clear that the absorbance vs concentration is a straight line.  

From the graph, we can obtain-  

Y = 5.73 X – 0.0065

Absorbance = 0.232

0.232 = 5.73 X – 0.0065

X = 0.0416  

Concentration of unknown solution is 0.0416 M

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Br + Br -> Br2 (covalent bond) 

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A chemist prepares a solution of aluminum sulfate (Al2(SO4) by weighing out 116.0 g of aluminum sulfate into a 450. mL volumetri
trasher [3.6K]

Answer:

0.0733 mol /dL

Explanation:

Mole -

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

From the information of the question ,

w = 116.0 g

As we know, molecular mass of aluminum sulfate ,

m = 342.15 g/mol

n = w / m  

n = 116.0 g /  342.15 g/mol = 0.33 mol

Molarity -

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity

V = volume of solution in liter ,

n = moles of solute ,

The unit is mol / L ,

Hence , from the question, the value of molarity is asked ,

From the information of the question ,

V = 450 mL ,

Since,

1 mL = 0.01 dL

As, the unit asked in the question is in dL,

V = 4.5 dL

n = 0.33 mol ( as calculated above )

Using the above formula ,

M = n / V  

M = 0.33 mol / 4.5 dL

M = 0.0733 mol /dL

M =

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3 years ago
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NikAS [45]
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Which of Graphs 1 correctly represents the relationship between the pressure and volume of a gas?
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Answer:

D

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4 0
3 years ago
When the following equation is balanced, what is the lowest whole-number coefficient for SO2? ____ HBrO3(aq) + ____ SO2(g) + ___
lakkis [162]

Answer : The lowest whole-number coefficient for SO_2 is, 5

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

The coefficient tell us about that how many molecules or atoms present in the chemical equation.

The given unbalanced chemical reaction is,

HBrO_3(aq)+SO_2(g)+H_2O(l)\rightarrow Br_2(aq)+H_2SO_4(aq)

This reaction is an unbalanced chemical reaction because in this reaction number of hydrogen, bromine and oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the HBrO_3, the coefficient '5' put before the SO_2\text{ and }H_2SO_4 and the coefficient '4' put before the H_2O and we get the balanced chemical equation.

The balanced chemical reaction will be,

2HBrO_3(aq)+5SO_2(g)+4H_2O(l)\rightarrow Br_2(aq)+5H_2SO_4(aq)

Thus, the lowest whole-number coefficient for SO_2 is, 5

8 0
3 years ago
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