Question

how to balance equation for the reaction of Sodium Potassium and calcium in cold water ​

Answer 1

2K + 2H2O = 2KOH + H2

Potassium when reacts with water gives potassium hydroxide and hydrogen gas.

Ca + 2H2O = Ca(OH)2 + H2

Calcium reacts with water gives calcium hydroxide and release hydrogen gas.

2Na + 2H2O = 2NaOH + H2

Sodium reacts with water gives sodium hydroxide and release hydrogen gas.

Answer 2

Answer:

2Na + 2H2O →2NaOH + H2 (For sodium)

2K + 2H2O → 2KOH + H2 (For potassium)