What is the ph of a solution with a concentration of 4.2 × 10–5 m h3o+? 2.31 4.38 5.62 6.87

Answer : The pH of the solution is, 4.38

Explanation :

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

Formula used :

Now put the value of hydronium ion concentration in this formula, we get the value of pH.

Therefore, the pH of the solution is, 4.38

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.