I have been making labeling medium for NMR work where I add the following:

K2HPO4 12 g/L

KH2PO4 9 g/L

15NH4Cl 3 g/L

NaCl 2.5 g/L

ISOGRO®-13C,15N, Powder 1 g/L

13C-Glucose 4 g/L

MgSO4 0.5 g/L

H2O 1 L (pH adjusted to ~7.4 with NaOH)

When I adjust the pH to 7.4 I observe a huge precipitation. What is precipitating?

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