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Looking at the standard curve above , what would be the concentration (96V / V) of an unknown solution with an absorbance of 0.35

Looking at the standard curve above , what would be the concentration (96V / V) of an unknown solution with an absorbance of 0.35 class=

Answer :

fichoh

The volume of the unknown solution obtained from the given standard curve is 2.57%

The linear equation produced by the standard curve is :

[tex]y = 0.136x + 0.001[/tex]

  • y = absorbance ;
  • x = concentration in percent (v/v)

Unknown Solution with absorbance value of 0.35 ;

  • y = 0.35

Input the value of y into the equation.

[tex]0.35 = 0.136x + 0.001[/tex]

Collect like terms

[tex]0.35 - 0.001 = 0.136x[/tex]

[tex]0.349 = 0.136x[/tex]

Divide both sides by 0.136

[tex]x = \frac{0.349}{0.136} [/tex]

[tex]x = 2.566[/tex]

[tex]x = 2.57[/tex]

Hence, percentage by volume of the unknown solution will be 2.57%

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