Division 4.1.2 Solution B:

Dissolve 346·0 g of sodium potassium tartrate tetrahydrate (KNaC₄H₄O₆.4H₂O) and 100 g of sodium hydroxide in water. Make up to volume in a 1 000 ml volumetric flask. Decant the clear solution from any sediment that may from time to time form.