Measurement of the pH of Rain

Today, with precipitation in the forecast, I set up my mini-laboratory to measure the pH of the local rainfall in Stormstown, PA. First, I installed a standard rain gauge to collect rainwater.

pH-1

I calibrated my pH meter, prior to taking any actual measurements, using standard reagents of pH of 4.0 and 6.86. I used a pH 7.0 reagent to verify.

pH-2

After calibration, I waited for some rainfall and then collected my sample.

P1030560

It had rained 0.20 inches over the past two days.

P1030561

This was about 400 ml of liquid.

P1030564

I measured the pH to be about 5.15, which is in the normal range for rainfall but still acidic. It is not considered to be acid rain.

pH Scale

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