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Chapter 19: Q19.42P (page 874)

What is the difference between the endpoint of titration and the equivalence point? Is the equivalence point always reached first? Explain.

Short Answer

Expert verified

A point at which the amount of acid equals the amount of base is known as an equivalence point. An endpoint is the point at which an indicator changes color. To ensure that a complete reaction occurs, an equivalence point must occur first or concurrently with an endpoint.

Step by step solution

01

Define equivalence point

In a titration, an equivalence point is reached when the amount of titrant administered is sufficient to totally neutralize an analyte solution.

02

Explanation

An equivalence point is a point on a curve when the amount of acid in a solution equals the amount of base.

An endpoint of a curve is a point at which an indicator changes color.

To signify a complete reaction, an equivalence point must always appear before a terminus. Depending on the pH of an analogous point, it can also be at the same place in a curve.

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Most popular questions from this chapter

Choose specific acid-base conjugate pairs to make the following buffers: (a) pH鈮�3.5 ; (b)pH鈮�5.5
. (See Appendix C.)

Amino acids [general formula NH2CH(R)COOH]can be considered polypro tic acids. In many cases, the R group contains additional amine and carboxyl groups.

(a) Can an amino acid dissolved in pure water have a protonated localid="1663345833873" COOH group and an unprotonated localid="1663345865389" NH2group

localid="1663345870225" (KX辞蹿颁翱翱贬驳谤辞耻辫=4.47脳10-3;KbofNH2驳谤辞耻辫=6.03脳10-3y?

Use glycine, localid="1663345879880" NH3CH3COOH, to explain why.

(b) Calculate localid="1663345908281" [+NH3CH2COO-y+NH3CH2COOH]atpH5.5.

(c) The R group of lysine is localid="1663345894686" -CH2CH2CH2CH2NH2(pKb=3.47)Draw the structure of lysine at .localid="1663345916050" pHphysiological localid="1663345902202" pH(-7),andpH13.

(d) Thelocalid="1663345947279" Rgroup of glutamic acid localid="1663345920800" -CH2CH2COOH(pKa=4.07).of the forms of glutamic acid that are shown below, which predominates at,localid="1663345941655" (1)localid="1663345993071" pH1(2) localid="1663345925494" physaiologicalpHH(-7),

and (3) localid="1663345936358" pH13?

What is the component concentration ratio,[Pr-]/[HPr], of a buffer that has a pH of5.44 (Kaof HPr鈥�=鈥�1.3脳10-5)?

Explain how strong acid鈥搒trong base, weak acid鈥搒trong base, and weak base鈥搒trong acid titrations using the same concentrations differ in terms of (a) the initial pH and (b) the pH at the equivalence point. (The component in italics is in the flask.)

The solubility of zinc oxalate is7.9脳10-3M补迟18掳颁.Calculate itsKsp.
See all solutions

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