Buffers — Definition & Overview
Read this topicExplanations 4
- How Do Cells Control pH Levels? A buffer is a substance that reacts with a strong acid or base to prevent significant changes in pH. This word is sometimes used casually, like "…
By Deena Hauze, Alex Federspiel, Gabi Slizewska, Mario Janakis
- Resisting Changes in pH A buffer is a solution that resists changes in pH. They are most commonly formed by the addition of a weak base or weak acid to water. Weak bases and aci…
By Jasper Brown, Mario Janakis
- (Video) Buffers, the Acid Rain Slayer by CrashCourse The video above explains what a buffer is. It is a solution that prevents drastic pH changes when an acid or base is added t…
By Gabi Slizewska, Mario Janakis
- What Are Buffers? A buffer is a solution that resists changes in pH when small amounts of acids or bases are added to it. Remember that organisms function in strict pH ranges. B…
By Sylvia Freeman, Mario Janakis, Gabi Slizewska, Cassie Gates
Problems 30
- How do you think adding an acid to a buffered base will affect the pH of the solution?
- What type of chemical are buffers?
- According to the graph above, at what volume of NaOH does the solution become neutralized?
- Michael's wants to make a buffer solution using a weak acid. According to the image above, which of the acids below should be used?
- What are buffers?
- Adding a base to an unbuffered solution would cause which of the following to occur?
- The safe pH range for blood is 7.35 - 7.45. Death might occur if the pH drops below 6.8 or spikes above 8.0. Which of the following best explains how buffers help maintain a saf…
- The bicarbonate buffer system is used biologically in blood and other body fluids. Which of the following options correctly identifies the weak acid and its conjugate base?
- Enzyme-catalyzed reactions have an optimal pH at which they are able to do their jobs best. Pepsin, a stomach enzyme, has an optimum pH of 2. Based on the given information, sel…
- Study the pH vs relative rate of reaction plot shown above. At what pH does the reaction proceed the fastest?
- Which of the following compounds is the conjugate base of H2_22PO4_44−^-−?
- Study the chemical reaction shown above. Identify the conjugate base of NH4_44+^++.
- B-Amylase is an enzyme that converts starches into sugar. It is only useful with a pH of around 5.2. Which buffer(s) will maintain the optimal pH for B-Amylase?
- Hydrocyanic acid (HCN) is shown above. Which of the following options is the conjugate base of HCN?
- Which of the following options would most likely occur when an acid is added to an unbuffered solution?
- What is buffer capacity?
- Nitrous acid (HNO2_22) is a weak acid. Which of the following options is its conjugate base?
- How would the addition of a weak base to a buffered acid affect the pH of the solution?
- Study the chemical reaction shown above. Identify the conjugate base of H2_22O.
- Adding an acid to an unbuffered solution would cause which of the following to occur?
- Which compound could be used to form a buffer?
- Sulfuric acid is a diprotic acid. This means that it can deprotonate twice. In its first deprotonation it forms a proton and hydrogen sulfate. In the second it forms another pro…
- If HClHClHCl and NaOHNaOHNaOH are both added to water, is a buffer solution formed?
- If a given enzyme requires a pH of 7.3 to function, which chemical should be used to create the alkaline environment?
- Which compounds are conjugate bases in the following reaction? A+BH⇌AH++B−A+BH\rightleftharpoons AH^{+}+B^{-}A+BH⇌AH++B−
- Select the conjugate acid of CH3COO−CH_{3}COO^{-}CH3COO− from the equation below CH3COOH+H2O⇌H3O++CH3COO−CH_{3}COOH+H_{2}O\rightleftharpoons H_{3}O^{+}+CH_{3}COO^{-}CH3COOH+H2…
- Which of the following situations would require a buffer?
- Which solution will have the lowest pH after 1 mole of HCl is added?
- Select the compounds that will form acidic buffers
- Which substance will produce a basic buffer?