Chemistry Mole Concept

• Jasmine ngjiamin

  11 Sep 11, 21:25

  Hi, I am here with another mole concept question.

  What is the vol. of distilled water needed to be added to 60cm3 of sulfuric acid of 2.0mol/dm3 to produce a 0.3mol/dm3 sulfuric acid? 

  Thank you.

• UltimaOnline

  11 Sep 11, 21:34

  Originally posted by Jasmine ngjiamin:

  Hi, I am here with another mole concept question.

  What is the vol. of distilled water needed to be added to 60cm3 of sulfuric acid of 2.0mol/dm3 to produce a 0.3mol/dm3 sulfuric acid? 

  Thank you.

   

  Let vol of distilled water added be x dm3.

  Moles of H2SO4 present = (60/1000)(2.0) = 1.2x10^-1 mol

  Final molarity of H2SO4 = 0.3 mol/dm3 

  Moles / Volume = 0.3 mol/dm3

  ( 1.2x10^-1 ) mol / ( (60/1000) + x) dm3 = 0.3 mol/dm3

  Solve for x.

  0.3x + 1.8x10^-2 = 1.2x10^-1

  x = 3.4x10^-1 dm3 = 340 cm3

• Jasmine ngjiamin

  11 Sep 11, 21:49

  thank you

• UltimaOnline

  12 Sep 11, 00:11

  Originally posted by Jasmine ngjiamin:

  thank you

  
  You're welcome, Jasmine. 

  Remember, in Chemistry calculations, Algeba is your best friend!