# In a solution of 0.10 M H2SO4, the ions present in order of decreasing order.

• alliereid
In summary, the "0.10 M" in the solution signifies the molarity or concentration, specifically 0.10 moles of H2SO4 per liter of solution. The order of ions in a solution of H2SO4 is determined by the chemical formula, with H+ listed first, followed by S2- and O2- in decreasing order. This order is important as it affects the properties and behavior of the solution. "Decreasing order" indicates that the ions are listed from highest to lowest concentration. The concentration of a solution directly impacts the order of ions, with higher concentration solutions having a different order compared to lower concentration solutions.
alliereid

## Homework Statement

The answer is [ H3O+ ] > [HSO4-]>[SO4-2]>[OH-], but I do not understand how they got it?

## The Attempt at a Solution

First I tried to put H2SO4 into water and got HSO4-. Then I tried to make an ice table, but it didn't work out since Ka for H2SO4 = very large?

H2SO4 + H2O <====> HSO4- + H3O+

It is a problem in logic. You don't need to do an exact calculation.

H2SO4 + H2O <====> SO4-2 + 2H3O+

HSO4- + H2O <====> SO4-2 + H3O+

After doing some calculations and considering the equilibrium constant, it can be determined that the concentration of H3O+ is the highest, followed by HSO4-, SO4-2, and OH-. This is because H3O+ is the product of both reactions involving H2SO4, and the equilibrium constant for those reactions is very large, indicating a high concentration of products. HSO4- and SO4-2 have a smaller concentration compared to H3O+ because they are the products of only one reaction each, and the equilibrium constant for those reactions is smaller. OH- has the lowest concentration because it is the product of a reaction with a very small equilibrium constant, indicating a low concentration of products. Overall, the ions present in a 0.10 M H2SO4 solution are in the order of [H3O+] > [HSO4-] > [SO4-2] > [OH-].

## 1. What does the "0.10 M" in the solution signify?

The "0.10 M" in the solution refers to the molarity or concentration of the solution. It means that there is 0.10 moles of H2SO4 in every liter of the solution.

## 2. How do you determine the order of ions in a solution of H2SO4?

The order of ions in a solution of H2SO4 can be determined by looking at the chemical formula of the compound. In this case, H2SO4 has 2 hydrogen (H) ions, 1 sulfur (S) ion, and 4 oxygen (O) ions. Therefore, the order of ions would be H+, S2-, and O2- in decreasing order.

## 3. Why is the order of ions important in a solution of H2SO4?

The order of ions in a solution of H2SO4 is important because it affects the properties and behavior of the solution. For example, the concentration of each ion will determine the strength and acidity of the solution.

## 4. What is the significance of "decreasing order" in the question?

The phrase "decreasing order" in the question means that the ions are listed from highest to lowest concentration. In this case, the highest concentration ion will be listed first, followed by the next highest concentration, and so on.

## 5. How does the concentration of a solution affect the order of ions?

The concentration of a solution directly affects the order of ions. In a higher concentration solution, there will be more ions present, and therefore the order of ions will be different compared to a lower concentration solution. The higher concentration solution will have a higher concentration of the first ion listed, followed by the next highest concentration ion, and so on.

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