# Which Anion Precipitates First in a Pb(NO3)2 Solution?

• n.a.s.h
In summary, the solution is 1.5×10−2 M in both CrO4^2-and SO4^2- and 0.55 M Pb (NO3)2(aq) is slowly added. The anion that will precipitate first from solution is Pb^{2+} and the concentration of Pb^{2+} at the point when the second anion begins to precipitate can be calculated using the solubility product and initial concentrations of the anions in the titration.
n.a.s.h

## Homework Statement

A solution is 1.5×10−2 M in both CrO4^2-and SO4^2-. To this solution, 0.55 M Pb (NO3)2(aq) is slowly added.

Which anion will precipitate first from solution?

a) CrO4^{2-}
b) SO4^{2-}

What is Pb^{2+} concentration at the point at which the second anion begins to precipitate?

## The Attempt at a Solution

k the thing that is confusing me is that the concentration of 0.55 M Pb (NO3)2(aq) was stated. Why is this relevant? because of that i do not know what to do

Things will begin to ppt when the solubility product is reached. You know the value for the solubility product of both lead sulfate and chromate, you know the initial concentrations of the anions, you need to calculate the concentration of lead at each point in the titration. Don't forget to adjust the concentrations of the anions as you add volume from the lead nitrate solution.

## 1. What is a chemistry precipitate?

A chemistry precipitate is a solid that forms when two or more solutions are mixed together. It is the result of a chemical reaction where the products are insoluble in the solvent and therefore appear as a solid.

## 2. How is a chemistry precipitate formed?

A chemistry precipitate is formed when two solutions are mixed together and a chemical reaction occurs, resulting in a solid being formed. This can be due to a change in temperature, pH, or the formation of new compounds that are insoluble in the solvent.

## 3. What is the purpose of a chemistry precipitate?

A chemistry precipitate can be used for various purposes, such as separating mixtures, purifying substances, or determining the presence of certain chemicals. It can also be used to synthesize new compounds and study their properties.

## 4. How do you identify a chemistry precipitate?

A chemistry precipitate can be identified by its physical properties, such as color, texture, and solubility. It can also be identified using chemical tests, such as adding acid or base to see if it dissolves or reacts, or using spectroscopy techniques to analyze its composition.

## 5. Can a chemistry precipitate be reversed?

In most cases, a chemistry precipitate cannot be reversed. Once a solid is formed, it can be difficult to return it to its original state. However, there are some exceptions where a precipitate can be dissolved by changing the conditions, such as adjusting the pH or temperature.

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