50.0ml of 0.10M HCL{aq} was added to 40.0ml of 0.10M NaOH{aq} and the mixture was stirred,then tested with a pH meter.What reading should be obtained for pH at 25.0degrees celcias?
HCl + NaOH ==>NaCl + H2O
moles HCl to start: M x L = 0.050 x 0.10 = 0.005 moles HCl.
moles NaOH to start: M x L = 0.040 x 0.1 = 0.004 moles NaOH.
All of the NaOH is used. We have 0.005-0.004 moles = 0.001 moles HCl remain unreacted (HCl) = 0.001 moles/0.100 L = 0.01 M HCl.
Since HCl is a strong acid, it ionizes 100%; therefore, (H^+) = 0.01 and the pH is ??
Check my work.
1.95
PH=-log[0.01]=1.95
To determine the pH of the resulting solution after the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), we need to understand that these two compounds undergo a neutralization reaction.
Firstly, we need to identify the balanced chemical equation for the reaction between HCl and NaOH:
HCl + NaOH → NaCl + H₂O
This reaction produces sodium chloride (NaCl) and water (H₂O). We can conclude from this equation that the reaction forms a salt and water, which means the resulting solution will be neutral (pH 7).
However, we should consider the volume of the solutions before the reaction occurred:
For HCl solution:
Volume = 50.0 mL
Concentration = 0.10 M
For NaOH solution:
Volume = 40.0 mL
Concentration = 0.10 M
In order to calculate the pH of the resulting solution, we need to determine the number of moles of HCl and NaOH used.
Moles of HCl = Concentration × Volume
Moles of HCl = 0.10 mol/L × 0.050 L (convert 50.0 mL to L) = 0.005 mol
Moles of NaOH = Concentration × Volume
Moles of NaOH = 0.10 mol/L × 0.040 L (convert 40.0 mL to L) = 0.004 mol
Since HCl and NaOH react in a 1:1 stoichiometric ratio, we can conclude that all the moles of HCl will react with the moles of NaOH.
After the reaction, we have 0.004 mol of NaOH completely consumed by 0.004 mol of HCl. Therefore, there are no excess HCl or NaOH remaining.
Since all the reactants are completely consumed, the resulting solution after the neutralization reaction will contain only water and NaCl (salt). As mentioned earlier, this means that the pH should be neutral with a reading of pH 7.
Hence, with the given information, the pH reading obtained with the pH meter should be 7.