It’s Quiz Time! Close your notes, clear your desks, and answer the following question: What does the following graph depict? A friend of mine said: “it’s an exothermic reaction!” And to that, I said, “Incorrect!”.Read More
When I first heard about a calorimeter, I had no idea what it was or what relevance it would have to me and my major. Before I delve into the relevance of calorimetry though, let’s first talk about what it is. Calorimetry is the science of measuring the amount of heat transferred to or from a substance in a reaction by using a calorimeter to measure the heat exchanged with the surroundings.Read More
As a student, when I was taught titration, it was accompanied by a long laundry list of scenarios: titration of a strong acid with a strong base, titration of a strong base with a strong acid, titration of a weak acid with a strong base, and titration of a weak base with a strong acid. Each of these scenarios were followed by a graph that corresponded to changes in pH, like the followingRead More
The electrochemistry unit at CU begins with redox reactions. Make sure you understand the basics of this before continuing through this article.
A voltaic cell, a.k.a. a galvanic cell, requires several parts. In official terms, you’ll need a cathode, an anode, and a conductive substance (usually wire) and salt bridge connecting the two. Less formally, you’ll needRead More
A buffer, by definition, is a solution that resist change in pH. In a buffered solution, adding acid will only result in a small decrease in pH whereas adding the same volume and concentration of acid to a non-buffered solution will cause a much larger change in pH.Read More
Each element in a chemical equation has an oxidation state, and you will have to assign these oxidation states to each element in order to determine the correct redox reaction stoichiometry. These states can be fairly easily determined just by looking at the periodic table.Read More
The following will be covered in this article:
Strong vs. weak acids and bases
Conjugate acids and conjugate bases
Basic pH calculations
Consider the following mechanism for the overall reaction A+B→C
How do we find the overall rate law for this reaction?
First of all, we need to know the Rate Determining Step (RDS) to write the rate law. Note that this is the slow step, as the part of the overall mechanism that proceeds the slowest will ultimately determine the overall rate of the reaction.Read More