What is the pH of the resulting solution when equal volumes of 0.01 m H2SO4 and 0.1 m HCl are mixed?

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The formation of the oxide ion O2- (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below,

Thus, the process of formation of O2- in the gas phase is unfavourable even though O2- is isoelectronic with neon. It is due to the fact that

electron repulsion outweighs the stability gained by achieving a noble gas configuration
O- ion has comparatively smaller size that oxygen atom
oxygen is more electronegative
oxygen is more electronegative

electron repulsion outweighs the stability gained by achieving a noble gas configuration

Electron repulsion predominates over the stability gained by achieving noble gas configuration. Hence, the formation of O2- in the gas phase is unfavourable.

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