Chemistry · Explorer

1/4
pH calibrationRunning
pH stabilizer. Hydrogen ion concentration at 79.44 µmol/L. Probe pH 4.1 pH, Buffer standard 4.5 pH. Currently probe ph is short by 0.4 pH.TUNING01234567891011121314ACIDICBASIC4.1 pH
t = 0.0s

Probe pH

4.1pH

Buffer standard

4.5pH

79.44 µmol/L

pH stabilizer. Hydrogen ion concentration at 79.44 µmol/L. Probe pH 4.1 pH, Buffer standard 4.5 pH. Currently probe ph is short by 0.4 pH.

What has to balancepH=−log⁡10[H+]pH = -\log_{10}[H^+]

What is happening

You are called to a soil probe being calibrated before a planting survey.

The probe cannot be trusted until it agrees with the reference. That buffer is certified at pH 4.5, and the probe is reporting a concentration that does not correspond to it.