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NCTE Activity - Water pH
Task with Student Directions

GLOBE Assessment
Grade 9-12

Literacy Activity for Protocol Test

Write a paragraph or short story that describes where the extra H+ ions in acidic water or the extra OH- ions in basic water come from.

pH Protocol Test

The pH protocol test assesses students' ability to collect accurate pH of water samples.

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Water pH Protocol Test





Student activity & Level of Performance

+ appropriate student performance

- inappropriate student performance

n.a. not appropriate or not observed

Accurate water pH measurements                                              
Rinse container 2+ times with test water                                              
Fill container 1/2 full with test water                                              
Submerge indicator paper for 1+ minutes                                              
Remove and compare to indicator color chart                                              
Identify pH; record results                                              
When pH reading is unclear                                              
Immerse used indicator in water for 1 minute                                              
Repeat until reading is clear; record results                                              
When pH reading is unclear after 10 min.                                              
Immerse new indicator paper for 1 minute                                              
If unclear, repeat and wait up to 10 minutes                                              
If clear, record results                                              
If unclear, record 2nd failure                                              


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