Acids, Bases and Salts

Which of these ions is responsible for making a solution acidic?

Which statement about the pH scale is correct?

What is the color of Universal Indicator in a solution of pH 2?

Rainwater that has dissolved sulfur dioxide from pollution is called acid rain. What is its typical pH compared to pure water?

Which material would you add to a lake to neutralize the effects of acid rain and raise the pH?

A solution of sodium hydrogencarbonate ($NaHCO_{3}$) is tested with Universal Indicator. What pH value and color are most likely?

Which of the following indicators is colorless in acidic solutions and blue in strongly alkaline solutions?

If the concentration of $OH^-$ ions in a solution is $1.0 \times 10^{-4}\text{ mol/dm}^3$, what is the pH of the solution at $25^{\circ}C$?

Which statement about the pH of $0.1\text{ mol/dm}^3$ $CH_3COOH$ is true?

A $0.1\text{ mol/dm}^3$ solution of acid $X$ has a pH of 1.0. When $10\text{ cm}^3$ of this acid is reacted with excess zinc, $24\text{ cm}^3$ of gas is produced. If $10\text{ cm}^3$ of a $0.1\text{ mol/dm}^3$ solution of acid $Y$ (pH 3.0) is used instead, what volume of gas is produced?

Which of these will react with an acid to produce only a salt and water?

Which of the following represents a neutral oxide?

What color is methyl orange in a neutral solution?

Which salt is produced by the reaction between magnesium and sulfuric acid?

A gas produced by the reaction of a carbonate and an acid is bubbled through limewater. What is the identity of the white precipitate formed in the limewater?

Which of the following compounds is an alkali?

Which substance will NOT react with dilute hydrochloric acid?

An element X is in Group 2. Which statement about its oxide is correct?

Which substance is an example of an amphoteric hydroxide?

What is the correct ionic equation for the reaction of $NH_4Cl(aq)$ and $KOH(aq)$?

Which reaction represents the behavior of a basic oxide?

The oxides of Period 3 elements change from basic to acidic. Which oxide is found in the middle of this trend and is amphoteric?

Which of the following oxides will NOT react with dilute sulfuric acid?

What is the nature of $Cl_2O_7$?

Which pair of oxides will both react with sulfuric acid?

Which of the following is NOT a property of an acidic oxide?

An oxide $M_{2}O$ dissolves in water to form a solution with a pH of 14. Which group does element M belong to?

A white solid oxide $X$ undergoes the series of tests shown in the flowchart. Based on the results of these tests, what is the most likely identity of oxide $X$?

Which of the following oxides would produce the most acidic solution when 1 mole of the oxide is dissolved in 1 $dm^3$ of water?

When solid $Al_2O_3$ is added to a solution of sodium hydroxide, it dissolves. Which ion is responsible for the $Al$ remaining in the solution?

If you react an excess of copper(II) carbonate with dilute nitric acid, what is the first step to obtain a solution of copper(II) nitrate?

Which acid should be used to prepare magnesium sulfate ($MgSO_4$)?

When preparing silver chloride, the mixture is filtered. Where is the silver chloride located after filtration?

Which of the following is the correct definition of a 'saturated solution'?

Which of the following is the correct ionic equation for the reaction between aqueous barium nitrate and aqueous sodium sulfate?

A student mixes calcium nitrate solution and potassium sulfate solution. What is the identity of the precipitate formed?

To prepare Lead(II) Nitrate from Lead(II) Oxide, why is the lead(II) oxide added to warm nitric acid?

A student uses the multi-step procedure shown in the diagram to prepare a pure sample of the soluble salt copper(II) nitrate, $Cu(NO_3)_2$, starting from copper(II) sulfate solution, $CuSO_4$. Why is 'Step 3' essential for ensuring that the final crystals are pure?

When preparing magnesium sulfate from magnesium oxide and sulfuric acid, why is the mixture heated after adding the oxide?

A salt preparation results in a yield of $80\%$. If the theoretical yield was $10.0\ g$, what was the actual mass of the salt obtained?

A gas is evolved during a reaction that has a choking smell and is acidic. It turns acidified potassium manganate(VII) from purple to colorless. What is the gas?

Which ion forms a green precipitate with sodium hydroxide that dissolves in excess to form a green solution?

A solution contains an unknown anion. Adding barium nitrate and nitric acid produces a white precipitate. Which ion is present?

In the test for nitrate ions, aluminum foil acts as a:

When aqueous sodium hydroxide is added to a solution containing magnesium ions ($Mg^{2+}$), a white precipitate is formed. What is the effect of adding excess sodium hydroxide?

Which observation identifies $SO_2$ gas using acidified potassium dichromate(VI) paper?

A solution contains both $Fe^{2+}$ and $Fe^{3+}$ ions. What is the color of the precipitate formed when aqueous sodium hydroxide is added?

In a qualitative analysis, a student adds aqueous sodium hydroxide to a solution and observes a white precipitate. Upon adding excess sodium hydroxide, the precipitate remains. Upon adding aqueous ammonia to a new sample, no precipitate is observed. Which ion is likely present?

The presence of which ion is confirmed by the formation of a yellow precipitate with aqueous silver nitrate which is insoluble in both dilute and concentrated aqueous ammonia?

A solid $V$ is heated and produces a reddish-brown gas and a gas that relights a glowing splint. The residue is black. When the residue is dissolved in acid, it forms a blue solution. Identify $V$.