Germination Rate CalculationGermination Rate Calculation

►Today is day 07 from when we began Today is day 07 from when we began germination. Calculate today’s rate.germination. Calculate today’s rate.

►Was your hypothesis supported by the data?Was your hypothesis supported by the data?

How do we measure pH?

DayDay SproutsSprouts Seed Seed TotalTotal

Hyp.Hyp.Rate %Rate %

5% 5% errorerror

Real Real Rate %Rate %

SupportSupportY / NY / N

66

77

88

99

1010

How do we measure pH?How do we measure pH?

Mr. M. GonzalezMr. M. Gonzalez

How do we measure pH?How do we measure pH?

ObjectivesObjectives

►I can measure pH values of different solutions.I can measure pH values of different solutions.►I can properly use a digital pH meter.I can properly use a digital pH meter.►I can prepare a table and bar graph to compare I can prepare a table and bar graph to compare

the pH values of different solutions.the pH values of different solutions.

How do we measure pH?

SafetySafety

►Remember none of the equipment was made to Remember none of the equipment was made to be dropped.be dropped.

►Wear gloves, aprons, and goggles.Wear gloves, aprons, and goggles.►Don’t rub your eyes or eat if you got chemicals Don’t rub your eyes or eat if you got chemicals

on your bare hands.on your bare hands.►WASH HANDS BEFORE LEAVING!WASH HANDS BEFORE LEAVING!

How do we measure pH?

ProceduresProcedures

►Setting upSetting up Listen to instructions.Listen to instructions. Read instructions and procedures if available.Read instructions and procedures if available. Take everything off your work area except for lab Take everything off your work area except for lab

instructions (if applicable) and make sure area is instructions (if applicable) and make sure area is clean.clean.

One person at a time from each group should gather One person at a time from each group should gather materials carrying them safely.materials carrying them safely.

Put on safety equipment.Put on safety equipment.

How do we measure pH?

Materials.Materials.

► Sample solutions (filtered water, chlorine, Sample solutions (filtered water, chlorine, vinegar, ammonia)vinegar, ammonia)

► Hanna Combo Meters x 8Hanna Combo Meters x 8► Storage solutions x 8Storage solutions x 8► Squirt bottles with filtered water x 8Squirt bottles with filtered water x 8► Paper towels x variousPaper towels x various► Disposable cups or beakers x 8Disposable cups or beakers x 8► Apron, gloves, and gogglesApron, gloves, and goggles► Non latex glovesNon latex gloves► Graph paperGraph paper

How do we measure pH?

CalibrationCalibration

►Prepare meter for readingPrepare meter for reading►Add to pH 7 standardAdd to pH 7 standard►If more than 0.4 units away from 7 then calibrateIf more than 0.4 units away from 7 then calibrate

How do we measure pH?

pH of Various SolutionspH of Various SolutionsItemItem Hyp. pHHyp. pH Your pHYour pH Other Other

groups’ pHgroups’ pHClass pH avg.Class pH avg.

AmmoniaAmmonia

ChlorineChlorine

VinegarVinegar

Filtered waterFiltered water

Fountain Fountain waterwater

How do we measure pH?

Come up with your hypothesisCome up with your hypothesisItemItem Hyp. pHHyp. pH Your pHYour pH Other Other

groups’ pHgroups’ pHClass pH avg.Class pH avg.

AmmoniaAmmonia

ChlorineChlorine

VinegarVinegar

Filtered waterFiltered water

Fountain Fountain waterwater

How do we measure pH?

Example of a final graphExample of a final graph

► graph should include bars graph should include bars for each for each AVERAGE AVERAGE solution valuesolution value

► The axis should have The axis should have labels and an adequate labels and an adequate scale. scale.

► graph should have a title graph should have a title that describes that describes information clearly and information clearly and concisely at the concisely at the bottombottom..

0

2

4

6

8

10

12

Vin

egar

Am

mon

ia

B. w

ater

Lem

onJu

ice

Fig. 01. pH values of …

pH

How do we measure pH?