Question

100.0 ml of 0.10 f h3po4 is mixed with 200.0 ml 0.15 m naoh.

Answer 1

To calculate the pH after adding 1.0 mL of 0.10 M NaOH to 100 mL of the buffer, we use the balanced equation and mole ratios to determine the excess reactant and calculate the remaining moles of H3PO4. We can then find the pH using the formula -log[H3PO4].

Step-by-step explanation:

To calculate the pH after adding 1.0 mL of 0.10 M NaOH to 100 mL of the buffer, we need to consider the reaction between H3PO4 and NaOH. The balanced equation is:

H3PO4 (aq) + 3NaOH (aq) → Na3PO4 (aq) + 3H2O (l)

First, we calculate the moles of H3PO4 and NaOH using their concentrations and volumes. Then we determine which reactant is in excess. For every mole of H3PO4, we need 3 moles of NaOH. If the moles of NaOH are in excess, we calculate the remaining moles of H3PO4 and use that to find the pH using the formula -log[H3PO4].