Home
Class 12
CHEMISTRY
A 500g tooth paste sample has 0.2g fluor...

A 500g tooth paste sample has 0.2g fluoride concentration. The concentration of `F^(-)` ion in terms of ppm level is 100 `xx` X. What is the value of X ?

Text Solution

Verified by Experts

The correct Answer is:
4
Mass of solute = 0.2 gm in 500gm tooth paste. So concentration per kg `= ( 0.2) / ( 500) xx 100` gm `= 0.4 g m // kg `
Since to find the level of `F^(-) `ion in ppm we need to convert the conc. In Mg AS
Conc of `F^(-)` ion in `Mg //Kg = 0.4 xx 100 mg // g m = 400 mg // kg `
Hence level of `F^(-)` ion in ppm `= ( " weight of solute")/("weigth of ion") = 400 mg //kg = 400 p p m = 100 xx 4 ` p p m
Promotional Banner

Similar Questions

Explore conceptually related problems

The concentration of hydrogen ion in a sample of soft drink is 3.8xx10^(-3)M . What is its pH ?

At certain temperature the proton concentration of pure water is 2.5 xx 10^(-7) M . What is the hydroxyl ion concentration ? What is the magnitude of K_w ?

DO value of a water sample is 6 ppm. The weight of dissolved oxygen present in 100 kg of water sample is x xx 10^(-1) gm. Then the value of x is ____.

A,B,C and D are four 100-mlL samples of water. Fluoride ion concentrations in these samples are 2, 5, 8 and 12 ppm respectively. One drop of alizarine - S dye is added to each of these samples. The order of intesity of pink colour in these water samples is

The Kc for the reaction I_(2 (g)) hArr 2I_((g)) is 4 xx 10^(-3) . If the equilibrium concentration of atomic iodine is 4 xx 10^(-2) M . What is the concentration of molecular iodine ?

The value of K_(c) for the reaction 3O_(2)(g)hArr2O_(3)(g) is 2.0xx10^(-50) at 25^(@)C . If the equilibrium concentration of O_(2) in air at 25^(@)C is 1.6xx10^(-2) , what is the concentration of O_(3) ?

A litre of sea water (which weighs 1030 g) contains 6xx10^(-3) g of dissolved oxygen . The concentration of dissolved oxygen is p'pm is

The value of K_(C) for the equilibrium reaction CO_(2)(g) +C(s)hArr 2 CO(g) at T (K) is 0 . 0 36 . If the equilibrium concentration of CO_(2) (g) is 0 . 004 M , the concentration of CO (g) in mol L^(-1) is