A chemist dissolves 450. mg of pure hydroiodic acid in enough water to make up 50. mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.

Determine the pH of a 1.58 x 10-6 M HI solution. Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs. pH =

What is the pH of 0.042 M sulfuric acid (H2SO4) solution? Express your answer in two decimal places.

A chemist dissolves 523.mg of pure sodium hydroxide in enough water to make up 140.mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25°C.) Be sure your answer has the correct number of significant digits.

Determine the pH of a 7.98 × 103 M Ca(OH)2 solution. Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs. pH =

Potassium is a very reactive metal, but in compounds it is present as the potassium ion and is not very reactive. For example, dry potassium bicarbonate powder can be used to extinguish burning liquids. Why is there such a difference in the reactivity of potassium metal and the potassium ion? A. The potassium in the bicarbonate salt is a base, but the potassium metal is an acid. B. The potassium in the bicarbonate salt is an acid, but the potassium metal is a base. C. The combustion of the liquids suppresses the potassium's ability to react. D. The potassium metal can readily ionize by losing its one valence electron; the potassium in the bicarbonate salt is already ionized. E. The potassium atom is bonded to an oxygen atom in the bicarbonate salt, but in the metal it is unbound and free to react.

A chemist dissolves 326. mg of pure hydrochloric acid in enough water to make up 250. mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.

A chemist dissolves 272. mg of pure potassium hydroxide in enough water to make up 100. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits.

A chemist dissolves 118. mg of pure potassium hydroxide in enough water to make up 60. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits. ☐

A chemist dissolves 874. mg of pure sodium hydroxide in enough water to make up 90. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits. 0 x10 X