How can I tell if something is a strong base or a weak base?

Antony determine the pH of a solution to be 6.8. What is the concentration of hydronium ions in this solution? Show your work.

pH and pOH of [H+] = 4.02×10-8 M

An engineer wants to determine whether a certain pH meter is working correctly.  She uses the meter to measure the pH in 14 neutral substances (pH = 7.0) and obtains the data shown in the following table. 7.01 7.04 6.97 7.00 6.99 6.97 7.04 7.04 7.01 7.00 6.99 7.04 7.07 6.97   Is there sufficient evidence that the meter is not correctly measuring the pH?

The pH of a weak base (B) is 8.73 when the concentration of the weak base is 0.012 M. What is the value of Kb for the weak base?

-8 Calculate the pH of a 4.9 x 10 M aqueous solution of hydroiodic acid (HI). Round your answer to 2 decimal places.

Determine the pH of a 5.13 x 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 =

4*) The autoionization constant for water at 35 °C is 2.2 × 10−14. Use this information to answer the following questions. a)What is the [H3O+] and pH of neutral water at 35 °C? b)Determine if the following solutions are acidic, neutral, or basic at 35 °C. Explain your answer. i)[H3O+] = 9.8 × 10−6 M ii)pH = 6.95 iii)[OH−] = 5.1 × 10−7 M iv)pOH = 9.24

The fish in your aquarium are ill so you test the pH of the water. It shows a pH of 9 whereas the pH should be 7. What would you add?

Determine the pH of a 3.03 × 10-3 M Ca(OH)2 solution.  Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs.    pH =