What is the minimum volume of $3.0$ $\mathrm{M}$ $\mathrm{HBr}$ required to completely dissolve $15.0 \mathrm{~g}$ of potassium metal? nn n n n n

Crime-scene investigators use luminol to visualize blood residue. Research luminol and determine its chemical formula and percent composition.

If a solution contains $0.85 \mathrm{~mol}$ of $\mathrm{OH}^{-}$, how many moles of $\mathrm{H}^{+}$would be required to reach the equivalence point in a titration?

The titration of 80.0 mL of an unknown concentration H$_3$PO$_4$ solution requires 126 mL of 0.218 M KOH solution. What is the concentration of the H$_3$PO$_4$ solution (in M)?

Write the reaction between sodium hydroxide and hydrochloric acid.

What is an acid–base neutralization reaction? Provide an example.

A solution contains one or more of the following ions: $\mathrm{Ag}^{+}, \mathrm{Ca}^{2+}$, and $\mathrm{Cu}^{2+}$. When sodium chloride is added to the solution, no precipitate occurs. When sodium sulfate is added to the solution, a white precipitate occurs. The precipitate is filtered off and sodium carbonate is added to the remaining solution, producing a precipitate. Which ions were present in the original solution? Write net ionic equations for the formation of each of the precipitates observed.

What is an acid-base neutralization reaction?

What volume (in mL) of a 0.150 M $\ce{HNO3}$ solution will completely react with 35.7 mL of a 0.108 M $\ce{Na2CO3}$ solution according to the following balanced chemical equation?

$$\ce{Na2CO3(aq) + 2HNO3(aq)} \rightarrow \ce{2NaNO3(aq) + CO2(g) + H2O(l)}$$

Calculate how many grams of carbon dioxide $\ce{CO2}$ are formed and express the result to three significant figures.

The density of a 20.0% by mass ethylene glycol ($C_2H_6O_2$) solution in water is 1.03 g/mL. Find the molarity of the solution.

Consider the reaction:

$$\mathrm{P}_4(\mathrm{~s})+6 \mathrm{H}_2(g) \longrightarrow 4 \mathrm{PH}_3(g)$$

(a) If $88.6 \mathrm{~L}$ of $\mathrm{H}_2(\mathrm{~g})$, measured at STP, is allowed to react with $158.3 \mathrm{~g}$ of $\mathrm{P}_4$, what is the limiting reactant?

(b) If $48.3 \mathrm{~L}$ of $\mathrm{PH}_3$, measured at $\mathrm{STP}$, forms, what is the percent yield?

What are some properties of bases

A 5.00 mL sample of nitric acid $(\ce{HNO3})$ solution is titrated with 33.5 mL of 0.201 M $\ce{NaOH}$. What is the molarity of the nitric acid solution?

a. 0.0300 M
b. 0.149 M
c. 6.7 M
d. 0.522 M
e. 1.35 M

Based on these molecular views, determine whether each pictured acid is weak or strong.