Give brief answers/descriptions for the following questions. Use the back or add
ID: 1084243 • Letter: G
Question
Give brief answers/descriptions for the following questions. Use the back or additional pages if required. Turn this worksheet in before you leave lab on the day that you perform the experiment. 1. What is the scientific rationale for including fluoride in domestic drinking water supplies and in dental care products? 2. Wha is the targetdconcentration range for fluoride ion in domestic drinking water supplies? 3. Calculate the amount of NaF required to prepare 1 liter of a solution containing 100 ppm F 4. What is the purpose of the TISAB buffer?Explanation / Answer
Q fluoride is added to drinking water supplies to prevent tooth decaying by forming a layer of fluoroapatite on its surface.
0.5 to 1.5 mg/ litre is targeted amount
Ppm =( mass of solute / mass of solution ) ×106
m = 100 ppm×10-6/1000. As 1. Litre =1000 g water for water
m = 10-7 g
Q TISAB buffer is used for the selective analysis as in fluoride ions .it help to increase the ionic strength of solution.
Q prepare the solution of measurable concentration and then use the formula of dilution which is N1V1= N2V2 and produced the concentration according to the desired amount by varying the volume
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