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11 Nov 2019
Write a balanced molecular equation for the reaction between the monoprotic weak acid sodium hydrogen sulfide (HNaS) and sodium hydroxide (NaOH) (5) 2. Use the balanced equation from Prelab #1 to answer this question: if the concentration of the sodium hydroxide solution is 0.0985 M and you used 30.5 ml to titrate the HNaS toa pink endpoint, how many moles of acid were present? How many moles of NaOH were used pale Show your work. (4) 3. How many total titrations will you perform in this experiment? (4) 4. A triprotic acid has three acidic hydrogens. One example is phosphoric acid, H:PO., which has three different Ka values (and three pKa values). These values are: pKa, 2.15 pKa 7.20 pKa 12.35 Sketch a titration plot of phosphoric acid with a strong base, like the examples given in the intro section of this lab. e of this lab experiment. Look over the pKa values for (4) 5. Look over Table I on the last pag the diprotic acids. Fumaric acid and Maleic acid have the same chemical formula (and sa molecular wei me these acids with 0.1 M NaOnger values Figure 3a, and one of these will generate a plot that looks like Figure 3b. mass). However, their pKa values are very different. When you titrate 0.1 M NaOH using a pH meter, one of these will generate a plot that looks like Which is which? And explain why you came up with this answer TA Chem 106
Write a balanced molecular equation for the reaction between the monoprotic weak acid sodium hydrogen sulfide (HNaS) and sodium hydroxide (NaOH) (5) 2. Use the balanced equation from Prelab #1 to answer this question: if the concentration of the sodium hydroxide solution is 0.0985 M and you used 30.5 ml to titrate the HNaS toa pink endpoint, how many moles of acid were present? How many moles of NaOH were used pale Show your work. (4) 3. How many total titrations will you perform in this experiment? (4) 4. A triprotic acid has three acidic hydrogens. One example is phosphoric acid, H:PO., which has three different Ka values (and three pKa values). These values are: pKa, 2.15 pKa 7.20 pKa 12.35 Sketch a titration plot of phosphoric acid with a strong base, like the examples given in the intro section of this lab. e of this lab experiment. Look over the pKa values for (4) 5. Look over Table I on the last pag the diprotic acids. Fumaric acid and Maleic acid have the same chemical formula (and sa molecular wei me these acids with 0.1 M NaOnger values Figure 3a, and one of these will generate a plot that looks like Figure 3b. mass). However, their pKa values are very different. When you titrate 0.1 M NaOH using a pH meter, one of these will generate a plot that looks like Which is which? And explain why you came up with this answer TA Chem 106
Lelia LubowitzLv2
18 Aug 2019