Practice Base in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A substance that accepts ions (protons) or donates ions when dissolved in solution, raising the pH above 7.
Slippery substances that can neutralize acids—they remove hydrogen ions.
Showing a random 20 of 50 problems.
Example 1
easyDoes litmus paper turn red or blue in a basic solution?
Example 2
easyCan a base be a solid, like ?
Example 3
hardCompute the pH of a solution made by dissolving 4.0 g NaOH () in 500 mL water.
Example 4
challengeEqual moles of NaOH (strong) and ammonia (weak) are each dissolved to the same volume. Which neutralizes more HCl, and why?
Example 5
hardIf 25.0 mL of 0.20 M HCl is added to 25.0 mL of 0.20 M NaOH, what is the resulting pH (assume 25°C)?
Example 6
easyBy the Bronsted-Lowry definition, a base accepts a ____.
Example 7
hardIdentify the conjugate acid-base pairs in .
Example 8
mediumWhy can a concentrated weak base have a lower pH than a dilute strong base?
Example 9
mediumIdentify the conjugate base of acting as an acid.
Example 10
easyBy the Arrhenius definition, what ion does a base produce in water?
Example 11
hardWhy does adding water to a strong base solution change pH by less than the dilution factor near pH 7?
Example 12
easyAccording to the Arrhenius definition, what makes a substance a base? Give two examples.
Example 13
hardFind the pH of a 0.05 M solution at 25°C.
Example 14
hard100 mL of 0.10 M NaOH is diluted to 1.0 L. What is the new pH at 25°C?
Example 15
easyIs a solution with pH 9 acidic, neutral, or basic?
Example 16
easyBy the Bronsted-Lowry definition, a base is a proton ____.
Example 17
mediumA NaOH solution: find , pOH, and pH.
Example 18
challengeA NaOH solution is diluted tenfold. Find the new pH (ignore water autoionization).
Example 19
easyAmmonia () is a base but has no in its formula. How can it be a base?
Example 20
mediumCalculate the pH of a 0.025 M KOH solution at 25°C.