The pH value is an expression of the molarity of \( \mathrm{H}_{3} \mathrm{O}^{+} \)ions in solution. This concentration has strong impact on chemical reactions. The molarity is very small value, and therefore awkward to use. The pH scale simplifies this concentration making communication easier and faster. Demonstrate the relationship between pH and \( \mathrm{H}_{3} \mathrm{O}^{+} \)molarity, using the formula, \( \mathrm{pH}=-\log \left(\mathrm{H}_{3} \mathrm{O}^{+}\right) \) where () indicates concentration in molarity of a substance. What is the pH of a solution, having the \( \mathrm{H}_{3} \mathrm{O}^{+} \)concentration of 0.000491 M ? Add your answer

What does word root indicate in IUPAC name? b. Write the suffix for doubly bonded \( (\mathrm{C}=\mathrm{C}) \) alcohol. c. Ifsame substituent is repeated thrice, which prefix is added to word root? \& Write IUPAC name of \( \mathrm{CH}_{3}-\mathrm{CH}(\mathrm{CI})-\mathrm{CH}_{2}-\mathrm{COOH} \). e. Which group is selected as suffix if -OH and -CHO both are present in the compound?

57. Rappresenta le equazioni delle seguenti reazioni specificando il nome dei prodotti. \( \begin{array}{ll}\text { a) ossidazione dell'esano } & \text { c) dibromurazione dell'esano } \\ \text { b) monoclorurazione del butano } & \text { d) ossidazione del propano }\end{array} \)

Which of these scholars laid the toundations tor modern chemistry?

5 What is meant by the term hygroscopic when referring to brake fluid?

1. Considere la evaporación de agua liquida para formar vapor a 1 atm de presion. a) ¿Est proceso es endotérrico oxotêrmico? b) ¿En cué intervalo de temperatura el proceso es espontaneo c) ¿En qué intervalo de temperatura es un proceso no espontàneo? d) ¿A qué temperaura las dos fases estàn en equilibrio?