pH Lab (1)

Question 1

Scientific Method

Answer 1

observations that lead to a general question addressed by experimentation

Question 2

Hypothesis

Answer 2

making predictions and must be testable

Question 3

Null Hypothesis

Answer 3

it states there is no difference in treatment and control group

Question 4

Theory

Answer 4

supported by evidence

Question 5

Law

Answer 5

proven idea

Question 6

Alternative Hypothesis

Answer 6

variable had an effect on the outcome of the experiment

Question 7

Standard Deviation

Answer 7

square root of variance (s)

Question 8

Standard Error

Answer 8

shows how much variation is associated with the mean

SE= st.dev /sqrt n

Question 9

Variance

Answer 9

measure of distribution of data (s^2)

S^2=sum of indv observed-mean ^2 / n-1

Question 10

T-test

Answer 10

type of analysis used to compare two sample means

Question 11

Mean

Answer 11

experimental/arithmetic average of data

Question 12

pH

Answer 12

hydrogen ion concentration

-log[H+]

pH of 7 only neutral with pure water @ 25 deg celcius

Question 13

Acidic Solution

Answer 13

donation of protons

higher concentration of H+ ions than OH (hydroxyls)

pH is less than 7

Question 14

Basic Solution

Answer 14

acceptance of protons

higher concentration of OH than H+ ions

pH is greater than 7

Question 15

Buffers

Answer 15

weak acids or bases that react with strong acids or bases to prevent changes in pH

buffers keep pH neutralized, the same.

pKa buffers prevent the solution from becoming too acidic or too basic

Question 16

Red Litmus Paper

Answer 16

red paper will stay red if acidic, will turn blue if basic

Question 17

Blue Litmus Paper

Answer 17

blue paper will stay blue if basic, will turn red if acidic

Question 18

P-Value

Answer 18

probability that there is no difference between control and treatment group

Question 19

Control Group

Answer 19

serves as standard of comparison

Question 20

Variable Group

Answer 20

receives the treatment and is compared to control group

Question 21

Solvent

Answer 21

a medium usually a liquid that dissolves substances ex:water

Question 22

Solute

Answer 22

a substance that is dissolved in a solvent ex:solute

Question 23

Solution

Answer 23

a homogenous mix of two or more substances

Question 24

pH Lab Results:

Answer 24

divider

Question 25

Tomato Juice

Answer 25

Acid

pH=2

Question 26

Cola

Answer 26

Acid

pH=3

Question 27

Lime Juice

Answer 27

Acid

pH=3

Question 28

Vinegar

Answer 28

Acid

pH=3

Question 29

Ammonia

Answer 29

Acid

pH=9

Question 30

Baking Soda

Answer 30

Basic

pH=8

Question 31

Salicylic Acid

Answer 31

Acid

pH=3

Question 32

Milk

Answer 32

Acid

pH=6

Question 33

NaCl

Answer 33

Neutral

pH=7

Question 34

Dish Soap

Answer 34

Acid

pH=2

Question 35

Distilled Water

Answer 35

Neutral

pH=7