solution is mixed with 40.00 mL of 1.2% (w/v, g/mL) Na2CO3 solution. What volume of 0.087 M HCl will be required to titrate the resultant solution to bromocresol green indicator end point (Bcg pH transition range 3.8-5.4, Fwt
solution is mixed with 40.00 mL of 1.2% (w/v, g/mL) Na2CO3 solution. What volume of 0.087 M HCl will be required to titrate the resultant solution to bromocresol green indicator end point (Bcg pH transition range 3.8-5.4, Fwt
Chapter24: Introduction To Spectrochemical Methods
Section: Chapter Questions
Problem 24.1QAP
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Question
A 50.0 mL of 3.1% (w/v, g/mL) NaOH solution is mixed with 40.00 mL of 1.2% (w/v, g/mL) Na2CO3 solution. What volume of 0.087 M HCl will be required to titrate the resultant solution to bromocresol green indicator end point (Bcg pH transition range 3.8-5.4, Fwt of NaOH=40 g/mol, Na2CO3= 105.99 g/mol).
Transcribed Image Text:Common Name
Transition Range, pH pK,*
Color Change† Indicator Type*
Thymol blue
1.2–2.8
1.65§
8.96§
R-Y
1
8.0–9.6
Y-B
Methyl yellow
Methyl orange
Bromocresol green
Methyl red
Bromocresol purple
Bromothymol blue
2.9–4.0
R-Y
2
3.1-4.4
3.46§
R-O
2
3.8–5.4
Y-B
4.66§
5.00§
6.128
7.10$
7.81§
1
4.2–6.3
R-Y
5.2–6.8
Y-P
1
6.2–7.6
Y-B
1
Phenol red
6.8–8.4
Y-R
1
Cresol purple
Phenolphthalein
Thymolphthalein
Alizarin yellow GG
7.6-9.2
Y-P
8.3–10.0
C-R
1
9.3–10.5
C-B
1
10–12
C-Y
*At ionic strength of 0.1.
†B = blue; C = colorless; O = orange; P = purple; R = red; Y = yellow.
$(1) Acid type: HIn + H,O = H;O* + In¯: (2) Base type: In + H,0 = InH+ + OH¯.
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