F^- ion 1.5 ppm 750 L NaF mass

F^- ion 1.5 ppm 750 L NaF mass

 

 

F^- ion 1.5 ppm 용액을 만들려면,

750 L 물에 NaF 몇 그램을 첨가해야 하는가?

 

 

Fluoride ion is added to drinking water

at low concentrations to prevent tooth decay.

What mass of sodium fluoride (NaF)

should be added to 750 L of water

to make a solution that is 1.5 ppm in fluoride ion?

 

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1.5 ppm = 1.5 mg/L

( 참고 https://ywpop.tistory.com/5345 )

 

 

 

1.5 mg/L = ? mg F^- / 750 L 용액

 

? = 1.5 × 750 = 1125 mg

= 1.125 g F^-

 

 

 

> NaF의 몰질량 = 41.99 g/mol

> F의 몰질량 = 19.00 g/mol

 

 

 

1.125 g F^-를 포함하는 NaF의 질량

= 1.125 g F^- × (41.99 g NaF / 19.00 g F)

= 1.125 × (41.99 / 19.00)

= 2.49 g NaF

 

 

 

답: 2.5 g