Separate Determination of Borohydride, Borate, Hydroxide, and Carbonate in the Borohydride Fuel Cell by Acid-Base and Iodometric Potentiometric Titration

Table 1

Approximate rates of borohydride ion BH₄⁻ decomposition due to hydrolysis at 25°C.

Concentration [OH^−] or pH	Initial rate of BH4^− decomposition
2.33 mol·L^−1	<0.1%·day^−1
pH = 13	≈1.5%·day^−1
pH = 11	≈7%·hr ^−1
pH = 9	≈0.2%·s^−1
pH = 7	>10%·s^−1