Question

D Temperature of Gas (Celsius) 64 Experiment 9 Titration of an Acid with a Base QUESTIONS PRE LAB How would the calculated concentration of the HCI be affected, if the sodium hydroxide were poured from a beaker that contained some water before the NaOH were added to it? l. 2. What color is phenolphthalein in acid? What color is it in base? 3. The acid and base in this experiment are completely harmless-True or False? Explain your answer.

Answer 1

"Lets consider the required concentration of NaOH is xM This means x moles of NaOH is added to 1 litre of water since beaker already had some y mL of water. So, total volume of water = (1000 + y) mL molarity of NaOH = (x/(1000 + y = 1000) M so, the molarity of this solution (x/1000 + y 1000) M < x M \r\n This means titration needs more mL of NaOH solution So come of HCl will be found more \r\n The calculated concentration of HCL will be found ""More"" Reason The HCl is titrated with NaOH The actual concentration of NaOH is less than expected because the solution of NaOH has more water than calculated."