groups and turn in ONE carbon cops o 1. Which of the acids studied are weak? Whi
ID: 1039075 • Letter: G
Question
groups and turn in ONE carbon cops o 1. Which of the acids studied are weak? Whic h are strong? How can you tell from the data? Calculate the pKa for the weak acid from the Ka values given in the lab manual. How does the experimentally determined pKa compare with the calculated values? 2. Examine the data for two diprotic acids of the same concentration. What is the volume at equivalence for each? Comment on the similarities. 3. 4. Using the graph paper attached, generate a good graph of pH vs. Volume Titrant for your sample and attach it to this report. Label the important points on the graph (initial pH, pH at a equivalence, volume at equivalence, pH at equivalence, final pH) 5. A buffer is a mixture of an acid and its conjugate base. Buffers resist changes to pH when strong base or strong acid are added. For the solution you titrated, identify the buffer region on the graph based on the data.Explanation / Answer
1. Strong acid H2SO4 and a slightly weak acid in comparison would be H2SO3 and HNO3. In H2SO4, we have 4-electronegative oxygen atoms which pulls the shared pair of electrons between O-H towards itself, thus making H more electropositive and labile. On the othe hand in the other two acids, the number of oxygen are less, lower effect on hydrogen attached and thus is a slightly weaker acid.
2. pH at half-equivalence = pKa of weak acid
= 2.61
3. Volume at equivalence would be same for H2SO4 and H2SO3 as both have two ionizable protons attached to it. The equivalence volume for HNO3 would be half of these two as only one ionizable proton exists in the molecule.
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