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In the formation of the hydronium ion, what acts as the Lewis base?

Hydroxide

Explanation:

Under the Lewis definition, hydroxide goes about as the Lewis base, giving its electron pair to H+. Accordingly, in this adaptation of the balanced response, what intrigues us isn't the salt that structures, however the covalent bond that structures among Gracious and H+ to frame water.

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Although the hydronium ion is the nominal Lewis acid here, it does not itself accept an electron pair, but acts merely as the source of the proton that coordinates with the Lewis base Water, is an excellent example of a compound that can act as both Lewis acids (electron acceptor) and Lewis bases (electron donor). Ions such as the bicarbonate ion (HCO3-) and bisulfate ion (HSO4-) are also compounds that act as both Lewis acids and bases because they can either lose or gain electrons.

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it's all four options.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.