Read the following instructions for testing soil pH:
To test the pH of garden soil, follow these steps:
First, collect a soil sample from a depth of six inches, removing all stones. Next, place the soil in a clean container and add distilled water until it reaches a thick consistency. Prior to inserting the testing probe, clean it thoroughly with a damp cloth to remove any residue. Once the probe is inserted, wait sixty seconds for the digital display to stabilize. Finally, record the pH reading.
According to the instructions, what must be done immediately before inserting the testing probe?
- Clean the probe thoroughly with a damp cloth.Answer
- BAdd distilled water to the soil sample.
- CWait sixty seconds for the digital display to stabilize.
- DRecord the pH reading.
Answer
Clean the probe thoroughly with a damp cloth.
The instructions use the transitional phrase 'Prior to' directly before mentioning the insertion of the testing probe. This indicates that the action of cleaning the probe thoroughly with a damp cloth is the step that must be completed immediately before the probe is placed in the soil mixture.
Step-by-Step Solution
Key Concept
Sequential Steps and Chronology