Citric acid, the main acidic component of Sprite, is triprotic. What is the concentration of citric acid in Sprite? If the stock solution of NaOH was standardized yesterday morning, is it necessary to standardize the solution today? Why or why not? Does the concentration of citric acid in your Sprite sample agree with the theoretical concentration of citric acid in Sprite see your answer for prelab question 5? Skip to main content.
Module 7: Titration of a Carbonated Beverage. Search for:. Lab 7 Worksheet Download the. I instruct them that as they perform each experiment they should record information about acids and bases. I then briefly go over what students will be doing at each station: At station 1 students are testing conductivity.
At station 2 students are testing blue and red litmus paper At station 3 students are testing phenolphthalein. Finally I divide students into cooperative groups and assign each group a station to start at.
This is a picture of the cooperative groups I use in my classroom. For more details on how I do this in my classroom see my reflection on cooperative groups in my Density Lesson. I give students 4 minutes per station and then have them rotate.
I time them using my TimerTools application. As students work I walk around to ensure that they stay on task. This is a movie showing students working on the labs and my checking for understanding as they are working.
For the first few stations I make sure to stop students and tell them to come up with generalizations of acids vs. The station which students have the hardest time is station 7 where some get confused as to how to explain the differences between acids and bases.
I help them out with the example that acids have a lower pH than bases, etc. Explain 30 minutes. I begin with having students write down properties of acids and base which I show on slides 2 and 3. Many of these are properties that they just discovered in their lab, so I make sure to refer to the lab when I present them. Next I go into the arrhenius definition of acids and bases on slides 4 and 5.
I also teach students the bronsted-lowry definition of acids and bases on slide 6. I note that they should work on questions and also work with a partner to study their acid and base names. This instructional choice reflects my desire to give an introduction to the vocabulary that students will encounter in their reading.
Student Activity : During the work portion of the class students are busy reading the assigned pages and answering the reading questions. I walk around the classroom helping students who have questions. Most of the questions are easily accessed by students, but the two that were challenging for students were these:. The wording of these questions confused students. While water is amphoteric, it either acts like an acid or a base depending on what is dissolved in it.
I want students doing this work because I believe it is more educationally valubale for them to wrestle with getting the information than it would be for them to sit and listen to me lecture for the whole class. Catch and Release Opportunities : As students begin to finish the reading questions I explain that we will go over the questions as a whole class and that students should be practicing memorizing the acid and base names that they made flash cards for at the beginning of class.
Stopping class to discuss this is important because some students will finish sooner than others and I want them to have a meaningful learning activity to turn to so that the learning environment stays productive. To wrap this lesson up I ask if any students have learned the names of the acids and bases.
This video of students studying acids and bases shows that some students have made significant progress toward this learning objective, and serves as a model to the rest of the class that this is a manageable task.
I then randomly call on students to provide answers for the reading questions. Most students have the correct answers, and students who do not are given the chance to change their answers. Ending class this way allows me to make sure students got out of the reading what I hoped they would, and it allows weaker readers the chance to correct their work and increase their confidence from the work that was correct. Empty Layer. Forgot password? Keep me signed in.
Your email? The email you used to create your account. The last part of your Myspace URL. Ex: myspace. Facebook Twitter Email. Full Name? Most people use their real name. Select Gender? This helps us keep people, musicians and brands searchable on Myspace. Please select Female Male Unspecified.Lords Of Acid's songs: Listen to songs by Lords Of Acid on Myspace, Crablouse in Its Native Environment. Lords Of Acid. Crablouse. 0. Joey's Sample to the Lab. Lords Of Acid. Crablouse. 8. Don't Kill for Love. Lords Of Acid. Crablouse.