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

students--> 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