(2) The addition of Na,SO, is continued until the second cation just starts to precipitate as the sulfate. What is the concentration of the first cation at this point? K for PbSO, 1.3 x 10, Ag,SO,= 1.2 x 10. -8

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.