Parts Per Million

Assertion: The concentration of pollutants in water or atmosphere is often expressed in terms of ppm Reason :Concentration in parts per million can be expressed as mass to mass, volume of volume and mass to volume .

In sum you were asked to prepare a frequency distribution table, regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12 -0.16 on any of these days.

Units of parts per million (ppm) or per billion (ppb) are often used to describe the concentrations of solutes in very dilute solutions. The units are defined as the number of grams of solution per million or per billion gram of solvent. Bay of Bengal has 2.1 ppm of lithium ions. What is the molality of Li^(+) in this water ? (Li = 7)

A 100 mL sample of water was treated to convert any iron present to Fe^(2+) . Addition of 25mL of 0.002M K_(2)Cr_(2)O_(7) resulted in the reaction. 6Fe^(2+)+Cr_(2)O_(7)^(2-)+14H^(+) to 6Fe^(3+)+2Cr^(3+)+7H_(2)O The excess K_(2)Cr_(2)O_(7) was back- titrated with 7.5mL of .01M Fe^(2+) solution. Calculate the parts per million (ppm) of iron in the water sample.

10 L of hard water required 0.56 g of lime (CaO) for removing hardness. Hence, temporary hardness in ppm (part per million 10^(6) ) of CaCO_(3) is:

10L of hard water required 0.56g of time (CaO) for removing hardness. Hence, temporary hardness in p p m (part per million, 10^6 ) of CaCO_3 is