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Chapter 11: Q2TY (page 245)

Verify the derivative in cell D7 of Figure 11-6.

Short Answer

Expert verified

The value 0.226 in cell D7 is verified.

Step by step solution

01

Information given

The derivative in cell D7=0.226. We need to verify the value. All the information must be taken from the following table

The second number in the third column, 86.5, is the average of the second and third volumes (86.0 and 87.0) in the first column.

02

Derivation

To compute the first derivative, each pair of volumes need to be averaged and the quantity 螖pH/螖V will be calculated. Between consecutive readings the change in pH is 螖pH and the change in volume is 螖V.

03

Calculation

The derivative 螖pH/螖V is calculated using the above-mentioned values.

鈭�pH鈭�V=4.626-4.40087-86=0.2261=0.226

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Most popular questions from this chapter

Titrating weak acid with weak base.

(a) Prepare a family of graphs for the titration of 50.0 mL of 0.020 0 M HA (pKa = 4.00) with 0.100 M B (pKb = 3.00, 6.00, and 9.00).

(b) Write the acid-base reaction that occurs when acetic acid and sodium benzoate (the salt of benzoic acid) are mixed, and find the equilibrium constant for the reaction. Find the pH of a solution prepared by mixing 212 mL of 0.200 M acetic acid with 325 mL of 0.050 0 M sodium benzoate.

Pyridine is half protonated in aqueous phosphate buffer at pH 5.2. If you mix 45 mL of phosphate buffer with 55 mL of methanol, the buffer must have a pH of 3.2 to half protonate pyridine. Suggest a reason why.

Indicator error. Consider the titration in Figure 11-2 in which the equivalence-point pH in Table 11-2 is 9.25 at a volume of 10.00 mL.

(a) Suppose you used the yellow-to-blue transition of thymol blue indicator to find the end point. According to Table 11-3, the last trace of green disappears near pH 9.6. What volume of base is required to reach pH 9.6? The difference between this volume an 10 mL is the indicator error.

(b) If you used cresol red, with a color change at pH 8.8, what would be the indicator error?

Titration on Diprotic Systems

11-31How many grams of dipotassium oxalate ( FM166.22) should be added to 20.0mLof0.800MHCIO4 to give a pHof 4.40when the solution is diluted to500mL ?

Titration on Diprotic Systems

11-26. Calculate the pHwhenrole="math" localid="1655019122863" 25.0mLof 0.0200M-2aminophenol have been titrated with role="math" localid="1655019100358" 10.9mLof0.0150MHCIO4 .
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