An $\mathrm{NaCl}$ solution is made using $133 \mathrm{~g}$ of $\mathrm{NaCl}$ and diluting to a total solution volume of $1.00 \mathrm{~L}$. Calculate the molarity and mass percent of the solution. (Assume a density of $1.08 \mathrm{~g} / \mathrm{mL}$ for the solution.)

Ten liters of a 4% acid solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?

$$\begin{matrix} \text{Liters of Solution} & \text{Percent (as a decimal)} & \text{Liters of Pure Acid}\\ \text{10} & \text{0.04}\\ \text{x} & \text{0.10}\\ & \text{0.05}\\ \end{matrix}$$

A chemist needs 12 gallons of a 20% acid solution. The solution is to be mixed from three solutions whose concentrations are 10%, 15%, and 25%. How many gallons of each solution will satisfy each condition? Use as little as possible of the 25% solution.

Suppose you have a solution that might contain any or all of the following cations:

$$\mathrm { Ni } ^ { 2 + } , \mathrm { Ag } ^ { + } , \mathrm { Sr } ^ { 2 + } ,$$

and

$$\mathrm { Mn } ^ { 2 + }$$

Addition of HCl solution causes a precipitate to form. After filtering off the precipitate,

$$H_2SO_4$$

solution is added to the resulting solution and another precipitate forms. This is filtered off, and a solution of NaOH is added to the resulting solution. No precipitate is observed. Which ions are present in each of the precipitates? Which of the four ions listed above must be absent from the original solution?

a. What is the difference between the graph of the solution set of ax+by<c and the graph of the solution set of $ax+b y \leq c$?

b. Describe the set that is obtained by intersecting the graph of the solution set of ax+by $\leq$ c with the graph of the solution set of $ax+b y \geq c$.

Determine whether the solution is correct. If the solution is not correct, describe the error and give the correct solution. -6z + 13 = 7z -6z + 13 - 6z = 7z - 6z 13 = z

Solve the inequality. Express the solution using interval notation and graph the solution set.

$|x|<7$

A chemist needs 10 liters of a 25% acid solution. The solution is to be mixed from three solutions whose concentrations are 10%, 20%, and 50%. How many liters of each solution will satisfy each condition? Use as little as possible of the 50% solution.

Which of the following statements does not correctly describe a basic solution? (13.3) (a) The solution has a $\mathrm{pH}$ less than 7 . (b) The solution conducts electricity. (c) The solution changes the color of litmus dye from red to blue. (d) The solution contains a higher concentration of $\mathrm{OH}^{-}$ions than $\mathrm{H}^{+}$ions.

A chemist needs 12 gallons of a 20% acid solution. The solution is to be mixed from three solutions whose concentrations are 10%, 15%, and 25%. How many gallons of each solution will satisfy each condition? Use as much as possible of the 25% solution.

You have a bottle containing an 18.2% solution of strontium nitrate (density=1.02 g/mL). a. What mass of strontium nitrate is dissolved in 80.0 mL of this solution? b. How many moles of strontium nitrate are dissolved in 80.0 mL of the solution? c. If 80.0 mL of this solution is diluted with 420.0 mL of water, what is the molarity of the solution?

A chemist needs 12 gallons of a 20% acid solution. The solution is to be mixed from three solutions whose concentrations are 10%, 15%, and 25%. How many gallons of each solution will satisfy each condition? Use 4 gallons of the 25% solution.

A chemist needs to mix a solution containing $30 \%$ insecticide with a solution containing $50 \%$ insecticide to make $200 \mathrm{~L}$ of a solution that is $42 \%$ insecticide. How much of each solution should she use?

Complete the table below.

Use a calculator to check the common solution. If the solution is correct, write correct. If the solution is not correct, write not correct. $x + y = 10 \quad 4 x + 2 y = 12 \quad ( - 4,14 )$