Plot the titration of a weak base with a strong acid. Show the titration curve using .106M NH3 and .225M HCl for a 50.00mL sample of the ammonia.
No idea where to start here. I'm supposed to plot the curve from 2mL increments (0-30).
Tip on homework:
*Remember to use the m1v1 = m2v2 equation when adding strong acid or base at the end of a titration. This applies after the equivalence point.
We can't draw diagrams on this forum but if you will google "titration curves" you will get good looking pictures.
That's okay, I'm just wondering how to calculate the pH's at each mL increment in order to create the graph.
To plot the titration curve of a weak base with a strong acid, we need to understand the process of titration and the behavior of the reactants during the titration. Here is a step-by-step guide to help you get started:
Step 1: Understanding titration
Titration is a technique used to determine the concentration of an unknown solution by reacting it with a known solution of a reactant (titrant) of known concentration until the reaction is complete. In this case, we are titrating a weak base (NH3) with a strong acid (HCl).
Step 2: Equivalence point
The equivalence point is the point in the titration where the reactants have combined in stoichiometric proportions. At this point, all the weak base has reacted with the strong acid, resulting in a neutral solution. The amount of titrant added at the equivalence point is called the equivalent volume.
Step 3: Titration curve
A titration curve is a plot of the pH of the solution being titrated against the volume of the titrant added. The curve typically shows the pH gradually changing until the equivalence point is reached, where the pH undergoes a rapid change. After the equivalence point, the pH continues to change but at a slower rate.
Step 4: Calculation of volumes
To plot the titration curve, we need to determine the volume of the titrant added at different points during the titration. In your case, the strong acid HCl is the titrant, and the weak base NH3 is being titrated. The initial volume of NH3 is given as 50.00 mL. You are asked to plot the curve in 2 mL increments from 0 to 30 mL.
Step 5: Calculation after the equivalence point
After the equivalence point, the titration shifts from determining the concentration to using the m1v1 = m2v2 equation. This equation allows us to calculate the concentration or volume of one solution based on the known concentration or volume of another solution.
Now, armed with this information, you can start plotting the titration curve. To begin, calculate the volume of HCl added at each interval (0 mL to 30 mL in 2 mL increments). For each volume, determine the corresponding pH by considering the reactions happening during the titration. You can use a pH meter or pH indicator to determine the pH.
Remember to label your axes (volume of titrant added and pH), plot the points, and connect them to form a curve. You should observe a gradual change in pH followed by a steep change around the equivalence point before reaching a plateau after the equivalence point.
I hope this explanation helps with plotting the titration curve. If you have any further questions, please feel free to ask!