Bell Ringer 9/18/15 Danny runs 4 miles in 32 minutes. What is his SPEED? (Take out your STUDY GUIDE)

Bell Ringer 9/18/15 Label the Atomic Number, Symbol, and Atomic Mass

pH Lab Lab is worth 30 Points. Everyone is responsible for completing their own lab. You can work with your table as you complete the lab.

Acids and Bases One of the most important aspects of a living system is the degree of acidity or alkalinity

Acids Number of hydronium ions in solutions is greater than the number of hydroxide ions HCl  H + + Cl -

Bases Number of hydroxide ions in solution is greater than the number of hydronium ions NaOH  Na + + OH -

pH Scale logarithmic scale for comparing the relative concentrations of hydronium ions and hydroxide ions in a solution ranges from 0 to 14  Each pH is 10X stronger than next  e.g. ph 1 is 10 times stronger than ph 2

the lower the pH the stronger the acid the higher the pH the stronger the base pH 7.0 is neutral

Buffers Control of pH is very important Most enzymes function only within a very narrow pH Control is accomplished with buffers made by the body Buffers keep a neutral pH (pH 7)

Buffers neutralize small amounts of either an acid or base added to a solution Complex buffering systems maintain the pH values of your body’s many fluids at normal and safe levels

Procedure Every table will have their own “Tray Well” and pH Test Strips W/ Key In each Tray Well is already prepared with the necessary solutions and compounds.

Procedure ON BOARD IS MAP OF TRAY WELL

Procedure 1. On PG 2 make predictions of whether the substance is an acid or base. 2. Rip the pH paper in half. (Save pH paper) and then dip the pH half into the respected Tray that you are testing. 3. Wait about 120 seconds, and then begin to compare to your key.

Procedure After you are done with you pH paper place paper on Paper towel on table. After all the substances have been tested, begin post analysis questions. Finally begin the graph under post lab analysis

Graph It is a bar graph The Independent Variable belongs on the X axis Dependent Variable belongs on the Y axis Must include Title, X axis, and Y axis labels Use markers that are on table