Note: If you were not in class yesterday (Wednesday), please get the companion handout from the front desk (Titration & Neutralization Calculations) and scroll down to the entry for Days 171-172 and complete that activity first.
Today you will review the process of titration and observe how the pH changes as a titration occurs; this is graphed with what is known as a titration curve. Check out the following link for a guided example of a titration & titration curve construction:
Titration Guided Demonstration: http://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/crm3s5_5.swf
After you work through the demonstration above, you will go to http://users.wfu.edu/ylwong/chem/titrationsimulator/index.html and complete 1 or more titration calculation samples. A video demonstrating how to carry out the titration, and what numbers to extract for your titration calculation, is shown below. Please watch the video for instructions on how to customize & interact with the simulation to self-check your work with titration calculations. (If the embedded video below does not show up/play, you will find the video on the Sample Drive in Eisley -> Video -> Solutions -> "Online Titration Simulation Demonstration"
Today's lesson is on a common laboratory analysis method known as titration. The video below will explain what titration is, how it is carried out, and the problem solving method used to solve titration/neutralization calculations. Play the video through, stopping after the 1st two worked examples; complete the 3rd example on your own, then finish the video to check your work.
Bellringer quiz on Molarity, Solution Prep & Dilutions. Discussed the pH scale and how to calculate pH.
For Monday: be sure that you have viewed the posted videos on pH & indicators. You do not need to watch the video on titrations for Monday
Bellringer quiz on Molarity calculations, Preparing Solutions (from solids) and Dilutions will be tomorrow...study the examples done in class this week.
Please watch the two videos below to be prepared for our continuing discussion of acids & bases:
For a recap of the acid/base introduction, view the video below and/or check out Ch. 23 in your textbook.
Today, you will look at molarity from a different perspective...we will start with a known concentration that we want to make, and describe 2 different ways to determine how to make such a solution. The first method will use the molar mass of the solute, the desired volume to be made and the concentration to determine how to create a solution from a solid solute; the second method will allow us to calculate how much a concentrated stock solution must be diluted to create a less concentrated solution.
Solutions Unit Assessment #1 today!
Afterwards, watch the video on "Solution Concentration - Molarity" from the embedded EDpuzzle below (or you can find it on the Sample Drive at school (Eisley -> Video -> Solutions folder)
After you've viewed and taken notes on the video, visit http://www.sciencegeek.net/Chemistry/Review/Molarity/ and complete the online exercise. Keep your work so that you can ask questions Monday if necessary.
Solubility & Temperature Lab today. After collecting your data, cleaning up, and calculating your solubilities, please fill out the form below.
Continuing our discussion from Friday on solubility, we worked on understanding and using solubility curve graphs in order to determine solubility at a given temperature, the saturated/unsaturated/supersaturated nature of the solution, and the amount of undissolved solute that would be found at the bottom of a container housing a supersaturated solution that's been disturbed. (Pause for a deep breath....) Following an in-class sheet of questions to reinforce these concepts, a packet for tomorrow's lab activity was distributed; the Pre-Lab Questions may be turned in prior to the start of tomorrow's lab for extra credit, so logn as they are neat, legible, and on non-notebook fuzzied paper. Required homework for smooth running and greater chance of success in the lab tomorrow is to read the packet (and wear appropriate shoes...).
The clip below will give you an idea of the sort of phenomena you are watching for to determine when you have hit the saturation temperature for your sample(s):
Today is a continuation of yesterday's discussion of the process of dissolving & solutions. In the video clip that follows, pay particular attention to the vocabulary that is used (solution, solute, solvent, and a new term, electrolytes), concepts that we have discussed previously (polarity) and the diagrams of water dissolving both sugar (a polar covalent compound) and table salt (an ionic compound).
One of the things that affects how much solute can be dissolved in solution is temperature, and depending on the solute (gas vs. solid), increasing or decreasing the temperature of the solvent can have different effects on solubility. Your next POGIL activity will deal with the concept of solubility (the quantification of just how much solute can be dissolved in a given amount of solvent at a given temperature), and how to determine what this solubility limit is.
Understanding what solubility is will help us understand and interpret solubility curve diagrams. Tomorrow, we will work more with solubility curve diagrams and explore terms such as saturated, unsaturated and (cue majestic fanfare) supersaturated solutions. In fact, our next lab activity will involve the construction of a solubility curve for an ionic substance...more on that to come.
This area will contain an overview of what was discussed/performed each day in class.