indicator lab - separating a break with 30 ml of acid and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Dhaval Rana Chemistry June 5, 2008 Lab #______ Objective: which of the following substances are indicators? A indicator is a chemical compound that is added in small amounts to a solution so that the pH ( acidity or alkalinity ) of the solution can be determined easily. Normally, the indicator causes the color of the solution to change depending on the pH. Solutions with a pH value above 7.0 are basic, and solutions with a pH value below 7.0 are acidic. Solutions with a pH value of 7.0 are neutral. Indicators themselves are frequently weak acids or bases. When introduced into a solution, they may bind to H+ ( Hydrogen ion) or OH- ( hydroxide ) ions. The different electron configurations of the bound indicator causes the indicator's color to change, which allows the pH to be determined by the different colors. In our lab we tested different substances to see if they were indicators or not by
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: separating a break with 30 ml of acid and 30 ml of base from the supply cabinet. In a spot plate reservoir place 2 drops of acid and add 2 drops of chemical being tested. In a spot plate reservoir place 2 drops of base and add 2 drops of chemical being tested. After following these procedures record your results. From my results it was shown that white paper, tap water, and distilled water were not indicators. Substances that were indicators are litmus paper, phydrion paper, phenolphthalein, iki, universal indicator, bromothymol blue, methyl orange, methyl red, isopropyl alcohol, Congo red, and benedicts solution. Through this lab we learned different substances that can serve as an indicator to distinguish the difference between acid and base....
View Full Document

This note was uploaded on 10/15/2010 for the course SCIENCE 161 taught by Professor Potenza during the Spring '10 term at Anne Arundel CC.

Page1 / 2

indicator lab - separating a break with 30 ml of acid and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online