Acid Base Test

Overall, I feel pretty confident about this test. I feel like this is the first unit in a long time that I understand. I did study quite a lot so I'm really hoping for a good grade. Here's some helpful links!

Acid Base video 1

Acid Base Video 2

Acid Base Equation Video

Online Titration

Acid Base Khan Academy

Acid Base Vision Learning

Unknown Acid Lab

More titration, woooo. It's very tedious and time consuming.  This lab has basically the same set up as the Acetic acid lab except instead of vinegar, we used an acid with an unknown concentration. The acid was a solid, so first we had to use the hot plate with the stirrer to dissolve it in distilled water. We were able to get a pretty good pink color on most of our titrations, however our average was very low so we had to do many trials.

Acetic Acid Lab 2

This lab we set out to find the percent of acetic acid in common vinegar. We standardized a solution of NaOH with the acid potassium hydrogen phthalate (KHP) in a titration to determine the molarity of NaOH. Next we used the standard NaOH solution to determine the percent of acetic acid in vinegar. Lastly we diluted 10mL vinegar with 90 mL distilled water to make a 100mL solution, add our KHP and titrate as usual. We used this dilution to compare. The lab was pretty fun. 

Acetic Acid lab

We began the Acetic Acid Lab today. This lab means we get to do titrations first hand. Today we just practiced the lab because it's quite tricky. A titration is  where a solution of known concentration is used to determine the concentration of an unknown solution. The titrant  is added from a buret to a known quantity of the unknown solution until the reaction is complete. In our lab, the titrant was our base, NaOh and the unknown solution is the substance in the flask, KHP and Acetic Acid, The indicator  is phenolphthalein, which turns the solution pink when the endpoint is reached. Also phenolphthalein is my new favorite word.

Here's the video Frank showed us in preparation for the lab:
Video

Quiz- Acid Base Thoughts

Wow this feels like the first easy quiz we've ever had. For once I feel like I'm doing chemistry right. A lot of it was doing ice-box and ph calculations which are easy if you memorize the steps.Overall I'm just hoping for a good grade.

Vitamin C Lab

Basically today we learned that Vitamin C is a essential nutrient: we need it to survive. Vitamin C is most commonly found in citrus fruits, but also in various vegetables. Lack of vitamin C can cause disease such as scurvy. Yarr.
     In this lab we worked on comparing the vitamin C concentration of different juices to  a 1mg/mL standard solution. To do this we added starch to 20 drops of each juice, then added a couple drops of iodine. This reaction will make a clear liquid. However, if you continue to add iodine after all the vitamin c has reacted, the solution will turn blue. More trials to do tomorrow.