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Mariana [72]
3 years ago
7

Which letter indicates the wavelength of the wave?

Chemistry
2 answers:
Anuta_ua [19.1K]3 years ago
7 0

Answer: Letter D represents the wavelength of the wave.

Explanation: We are given a wave in the image. Wave comprises of crests and troughs.

Wavelength of a wave is defined as the distance between the two crests or two troughs or one crest and one trough.

And here letter D is the distance between the two troughs. Hence, this indicates the wavelength of the wave.

Svet_ta [14]3 years ago
3 0

D represents the wavelength in your problem. The wavelength is the measurement between two crests and can be measured on the bottom crest or the top crest.

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Answer:

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

Bromocresol green, color change from pH = 4.0 to  5.6

Explanation:

The equation for the reaction is :

C_2H_5NH_2_(_a_q_)     +     H^+_(_a_q_)   ---      C_2H_5NH_{3(aq)}^+

concentration of C_2H_5NH_{2(aq) = 10%

10 g of C_2H_5NH_{2(aq) in 100 ml solution

molar mass = 45.08 g/mol

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= 0.222 mol

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= 2.22 M

number of moles of C_2H_5NH_{2(aq) in 20 mL can be determined as:

= 20 mL \times  2.22 M= 44*10^{-3} mole

Concentration of C_2H_5NH_2(aq) = \frac{44*10^{-3}*1000}{20}

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Similarly, The pKa Value of C_2H_5NH_{2(aq) is given as 10.75

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= 3.25

the pH value at equivalence point is,

pH= \frac{1}{2}pKa - \frac{1}{2}pKb-\frac{1}{2}log[C]

pH = \frac{14}{2}-\frac{3.25}{2}-\frac{1}{2}log [2.22]

pH = 5.21

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

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