You have a 5.5 Liter container of water. How many grams of NaCN would you have to add to get a pH of 11.6

Enter your answer in the provided box. The pH of a certain orange juice is 3.78. Calculate the H+ ion concentration.  [H+]=           M

A certain weak base has a ?b of 7.90×10−7. What concentration of this base will produce a pH of 10.03?

A certain weak base has a ?b of 7.40×10−7. What concentration of this base will produce a pH of 10.15?

Preparing a strong base solution with a given pH A chemist must prepare 700.0 mL of potassium hydroxide solution with a pH of 12.00 at 25 °C. She will do this in three steps: ⚫ Fill a 700.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid potassium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of potassium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits. g ☐ x10 ☑

A solution of formic acid (HCOOH) has a pH of 2.85. How many grams of formic acid are there in 100.0 mL of solution?

What is the pH of a solution prepared by adding 66.0 ml of 0.100 M HNO3 to 72.2 mL of 0.31 M NaOH? Express your answer using at least three significant figures. Do not use scientific notation.

Determine whether the salt CH3NH3Br is acidic, basic, or neutral. Make sure to explain your answer.

Preparing a strong base solution with a given pH A chemist must prepare 600.0 mL of sodium hydroxide solution with a pH of 13.60 at 25 °C. He will do this in three steps: • Fill a 600.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid sodium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits. g ☐ x10 ☑ 1/5

You measured the pH of 50mL of a 0.01M HCI solution (strong acid). Then, you measured the pH of 100mL of a 0.01M HCI solution (strong acid). What would you expect? The pH of the 2 solutions would be the same since [H3O+] is the same The pH of 100mL would be higher because the volume is greater The pH of 50mL would be higher because the [H3O+] is greater You would have to do the measurement to know for sure