a) How much of each, stock and water would be necessary todirectly make 10 ml of

Question

a) How much of each, stock and water would be necessary todirectly make 10 ml of a 1/100 dilution? b) If you were directly make 20 ml of a 0.02% solution using a2% stock , how much of each, stock and water, would you use? c)Given a stock of a sugar that is 10% how would you make 100ml of 3% sugar solution? a) How much of each, stock and water would be necessary todirectly make 10 ml of a 1/100 dilution? b) If you were directly make 20 ml of a 0.02% solution using a2% stock , how much of each, stock and water, would you use? c)Given a stock of a sugar that is 10% how would you make 100ml of 3% sugar solution?

Explanation / Answer

a) Required volume, V2 = 10 mL      Initial concentration =M1      Required concentrationM2= M1/100      Volume of stock solution required,V1 = M2 * V2 / M1                                                                = (10 mL)( M1/100) /(M1 )                                                                = 0.1 mL     Volume of water required = 10.0 mL -0.1 mL                                            = 9.9 mL b) Similarly     Volume of stock solution required,V1 = M2 * V2 / M1                                                                = (20 mL)( 0.02%) /(2% )                                                                = 0.2 mL    Volume of water required = 20.0 mL -0.2 mL                                            = 19.8 mL c) Volume of stock solution required, V1 =M2 * V2 / M1                                                                = (100 mL)( 3%) /(10% )                                                                = 30 mL    Volume of water required = 100.0 mL - 30 mL                                            = 70 mL b) Similarly     Volume of stock solution required,V1 = M2 * V2 / M1                                                                = (20 mL)( 0.02%) /(2% )                                                                = 0.2 mL    Volume of water required = 20.0 mL -0.2 mL                                            = 19.8 mL c) Volume of stock solution required, V1 =M2 * V2 / M1                                                                = (100 mL)( 3%) /(10% )                                                                = 30 mL    Volume of water required = 100.0 mL - 30 mL                                            = 70 mL                                                                = (20 mL)( 0.02%) /(2% )                                                                = 0.2 mL    Volume of water required = 20.0 mL -0.2 mL                                            = 19.8 mL c) Volume of stock solution required, V1 =M2 * V2 / M1                                                                = (100 mL)( 3%) /(10% )                                                                = 30 mL    Volume of water required = 100.0 mL - 30 mL                                            = 70 mL c) Volume of stock solution required, V1 =M2 * V2 / M1                                                                = (100 mL)( 3%) /(10% )                                                                = 30 mL    Volume of water required = 100.0 mL - 30 mL                                            = 70 mL                                                                = (100 mL)( 3%) /(10% )                                                                = 30 mL    Volume of water required = 100.0 mL - 30 mL                                            = 70 mL                                            = 70 mL

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