Two solutions are prepared separately:
* Solution A: 0.02 g of thymol blue, 0.01 g cresol red and 2 mL of ethanol
* Solution B: 0.8 g of sodium bicarbonate, 7.48 g of potassium chloride and 90 mL of water
* Mix Solution A and B and mix 9 mL of the mixed solution to 1000 mL of distilled water.
* This method to determinate the concentration of bicarbonates and carbonates is also called "Magni's method."