Conversion of PPM to Micromoles

Written by oxana fox
  • Share
  • Tweet
  • Share
  • Email

Parts per million (ppm) is a unit of concentration. When concentration of a substance is low, such as water contaminated with certain metals (iron, cadmium or magnesium), ppm becomes more convenient than standard units of concentration -- molarity or weight per cent -- used in chemistry. A mole is the unit in chemistry that measures the amount of substance. To make basic stoichiometric chemical calculations you need to convert ppm to moles or micromoles.

Skill level:
Moderate

Other People Are Reading

Things you need

  • Calculator

Show MoreHide

Instructions

  1. 1

    Multiply ppm by the weight of the solution, then divide by 1,000,000 to compute the mass of the compound. For example, if ppm of cadmium (Cd) is 20 and the mass of the solution is 500 grams, then the mass of the dissolved cadmium is (20 x 500) /1,000,000 = 0.01 grams.

  2. 2

    Get the atomic mass of the element presented in water from the Periodic Table of the Elements. In this example, the atomic mass of cadmium (Cd) is 112.

  3. 3

    Divide the weight of the compound by the atomic mass to calculate the number of moles. In this example, the number of moles is 0.01 / 112 = 0.000089 moles.

  4. 4

    Multiply the number of moles by 1,000,000 to calculate micromoles. In this example 0.000089 x 1,000,000 = 89 micromoles.

Don't Miss

Filter:
  • All types
  • Articles
  • Slideshows
  • Videos
Sort:
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the eHow.co.uk site, you consent to the use of cookies. For more information, please see our Cookie policy.