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Yo ml water comb dye. DATA TABLE 5-2. Concentration of Standard Solutions (5 pts) 112 Concentration of Diluted Stock Solution

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Answer #1

calculations :

1.Red Dye

  • stock solution : 10 ml ; red 0.15 g/L

mass of red in solution :0.15 g/L * (10ml/ 1000 ml/L) =1.5*10-3 g

Moles of red in solution :1.5*10-3 g / 496 g/mol = 3.02*10-6 mol

Conc. of solution :( 3.02*10-6 mol / 10 ml)* 1000 ml/L = 3.02*10-4mol/ L = 3.02*10-4M

  • 20 ml solution : 10/20 *100 = 50% dilution

mass of red in solution= =1.5*10-3 g  

Moles of red in solution :1.5*10-3 g / 496 g/mol = 3.02*10-6 mol

Conc. of solution :( 3.02*10-6 mol / 20 ml)* 1000 ml/L = 1.51*10-4M

similarly for

  • 25 % conc. : dilution will be till : 10 ml/0.25 = 40 ml

Conc. of solution :( 3.02*10-6 mol /40 ml)* 1000 ml/L = 7.56*10-5M

  • 12.5 % conc. : dilution will be till : 10 ml/0.125 = 80 ml

Conc. of solution :( 3.02*10-6 mol /80 ml)* 1000 ml/L = 3.78*10-5M

2. Yellow Dye

  • stock solution : 10 ml ; red 0.15 g/L

mass of red in solution :0.15 g/L * (10ml/ 1000 ml/L) =1.5*10-3 g

Moles of red in solution :1.5*10-3 g / 534 g/mol = 2.81*10-6 mol

Conc. of solution :( 2.81*10-6 mol / 10 ml)* 1000 ml/L = 2.81*10-4mol/ L = 2.81*10-4M

  • 20 ml solution : 10/20 *100 = 50% dilution

mass of red in solution= =1.5*10-3 g  

Moles of red in solution :1.5*10-3 g / 496 g/mol = 2.81*10-6 mol

Conc. of solution :( 2.81*10-6mol / 20 ml)* 1000 ml/L = 1.4*10-4mol/ L = 1.4*10-4M

similarly for

  • 25 % conc. : dilution will be till : 10 ml/0.25 = 40 ml

Conc. of solution :( 2.81*10-6 mol /40 ml)* 1000 ml/L = 0.702*10-4mol/ L = 7.02*10-5M

  • 12.5 % conc. : dilution will be till : 10 ml/0.125 = 80 ml

Conc. of solution :(2.81*10-6 mol /80 ml)* 1000 ml/L = 3.51*10-5M

  • 6.25 % conc. : dilution will be till : 10 ml/0.0625 = 160 ml

Conc. of solution :( 2.81*10-6 mol /160 ml)* 1000 ml/L = 1.76*10-5M

3. Blue Dye

  • stock solution : 10 ml ; red 0.15 g/L

mass of red in solution :0.15 g/L * (10ml/ 1000 ml/L) =1.5*10-3 g

Moles of red in solution :1.5*10-3 g / 466 g/mol = 3.22*10-6 mol

Conc. of solution :( 3.22*10-6 mol / 10 ml)* 1000 ml/L = 3.22*10-4mol/ L =3.22*10-4M

  • 20 ml solution : 10/20 *100 = 50% dilution

mass of red in solution= =1.5*10-3 g  

Moles of red in solution :1.5*10-3 g / 466 g/mol = 3.22*10-6 mol

Conc. of solution :( 3.22*10-6 mol / 20 ml)* 1000 ml/L   = 1.61*10-4M

similarly for

  • 25 % conc. : dilution will be till : 10 ml/0.25 = 40 ml

Conc. of solution :( 3.22*10-6mol /40 ml)* 1000 ml/L =  8.04*10-5M

  • 12.5 % conc. : dilution will be till : 10 ml/0.125 = 80 ml

Conc. of solution :(3.22*10-6 mol /80 ml)* 1000 ml/L =4.02*10-5M

  • 6.25 % conc. : dilution will be till : 10 ml/0.0625 = 160 ml

Conc. of solution :( 3.22*10-6/160 ml)* 1000 ml/L = 2.01*10-5M

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