What is the pKa value of 2-nitrophenol and how does it affect its chemical properties?

The pKa value of 2-nitrophenol is around 7.1. This value indicates that 2-nitrophenol is a weak acid. The lower the pKa value, the stronger the acid. The presence of the nitro group in 2-nitrophenol makes it more acidic compared to phenol. This affects its chemical properties by influencing its reactivity in various chemical reactions, such as protonation and deprotonation processes.