250 mL of 0.200 M aqueous ethylamine (C2H5NH2(aq), Kb = 5.6 × 10–4) is titrated with...
250 mL of 0.200 M aqueous ethylamine (C2H5NH2(aq), Kb = 5.6 × 10–4) is titrated with 0.200 M HCl(aq). Which of the following indicators would be most appropriate for detecting the equivalence point of the above titration? The range of pH values for which each indicator undergoes a color change is given in parentheses.
A. Crystal Violet (pH 0-1.8)
B. 2,4-Dinitrophenol (pH 2.5-4.0) C. Eriochrome Black T (pH
5.0-6.5) D. m-Nitrophenol (pH 6.8-8.5)
E. Alizarin yellow (pH 10.0-12.0)
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250 mL of 0.200 M aqueous ethylamine (C2H5NH2(aq), Kb = 5.6 ×
10–4) is titrated with...
2. A 35.00-ml sample of a 0.0870 M solution of ethylamine, C2H5NH2 (Kb = 5.6 x...
2. A 35.00-ml sample of a 0.0870 M solution of ethylamine, C2H5NH2 (Kb = 5.6 x 10), is titrated with 0.150 M HCI. (a) What is the equivalence volume of HCI? (b) Calculate the pH of the solution: (1) prior to the start of the titration. (ii) after addition of 10.15 mL of the 0.150 M HCI. (iii) after addition of 14.50 mL of the 0.150 M HCI. (iv) after addition of 6.00 mL of the HCl beyond the equivalence...
1. A 23.6 mL sample of 0.391 M ethylamine, C2H5NH2, is titrated with 0.315 M nitric...
1. A 23.6 mL sample of 0.391 M ethylamine, C2H5NH2, is titrated with 0.315 M nitric acid. At the equivalence point, the pH is . Ethylamine Kb = 4.3X10-4 Nitrous acid Ka1 = 4.5x10-4 2. A 29.1 mL sample of 0.336 M ethylamine, C2H5NH2, is titrated with 0.276 M hydrochloric acid. After adding 52.4 mL of hydrochloric acid, the pH is . hydrochloric acid Ka1 = 3.5x10-8 Ethylamine Kb = 4.3X10-4
Find the pH of the solution obtained when 32 mL of 0.087 M ethylamine, C2H5NH2, is...
Find the pH of the solution obtained when 32 mL of 0.087 M ethylamine, C2H5NH2, is titrated to the equivalence point with 0.15 M HCl. The value of Kb for ethylamine is 4.7 x 10-4. (in 3 s.f.)
A 22.8 mL sample of 0.242 M ethylamine, C2H5NH2, is titrated with 0.273 M hydrobromic acid....
A 22.8 mL sample of 0.242 M ethylamine, C2H5NH2, is titrated with 0.273 M hydrobromic acid. At the equivalence point, the pH is Use the Tables link in the References for any equilibrium constants that are required.
A 24.7 mL sample of 0.304 M ethylamine, C2H5NH2, is titrated with 0.249 M hydrochloric acid....
A 24.7 mL sample of 0.304 M ethylamine, C2H5NH2, is titrated with 0.249 M hydrochloric acid. At the equivalence point, the pH is ?? Use the Tables link in the References for any equilibrium constants that are required. please make the answer right and double check because i cant afford to get this wrong, thank you.
15. Which mixture would be the best butter? a. 1 M HF; 0.01 MF d. 0.1...
15. Which mixture would be the best butter? a. 1 M HF; 0.01 MF d. 0.1 M HC2H3O2; 0.01 M C2H302 b. 2 M HCI; 0.5 M CI e. 0.003 M HCIO; 0.003 M CIO C. 0.8 M H2C2O4; 0.8 M NaHC204 Thymol Blue 16. Which indicator would be the best for a titration of an hypoiodous acid (HIO), Ka = 2x 10-11 TABLE 16.1 Ranges of Color Changes for Several Acid-Base Indicators a. Crystal violet pH 2 0 3...
6.) Determine the pH during the titration of 34.9 mL of 0.220 M ethylamine (C2H5NH2, Kb...
6.) Determine the pH during the titration of 34.9 mL of 0.220 M ethylamine (C2H5NH2, Kb = 4.3×10-4) by 0.220 M HNO3 at the following points. (Assume the titration is done at 25 °C.) Note that state symbols are not shown for species in this problem. (a) Before the addition of any HNO3 (b) After the addition of 12.7 mL of HNO3 (c) At the titration midpoint (d) At the equivalence point (e) After adding 52.0 mL of HNO3
4. Two 0.100 M solutions of the weak acids HA and HB are titrated using KOH...
4. Two 0.100 M solutions of the weak acids HA and HB are titrated using KOH at 25°C. The pH at equivalence of HA is 8.5, while the pH at equivalence of HB is 10.3. 1. Which of these two acids is weaker? ii. Which of the indicators below would be suitable in the titration of HA? Which would be suitable in the titration of HB? Indicator Alizarin yellow GR phenolphthalein methyl orange methyl red bromothymol blue pH range for...
1.Determine the pH during the titration of 36.6 mL of 0.304 M ethylamine (C2H5NH2 , Kb...
1.Determine the pH during the titration of 36.6 mL of 0.304 M ethylamine (C2H5NH2 , Kb = 4.3×10-4) by 0.304 M HI at the following points. (a) Before the addition of any HI (b) After the addition of 16.1 mL of HI (c) At the titration midpoint (d) At the equivalence point (e) After adding 51.2 mL of HI b.Determine the pH during the titration of 61.4 mL of 0.450 M nitrous acid (Ka = 4.5×10-4) by 0.450 M NaOH...
A 25.0 mL volume of a 0.200 M N2H4 solution (Kb = 1.70 × 10−6) is...
A 25.0 mL volume of a 0.200 M N2H4
solution (Kb = 1.70 ×
10−6) is titrated to the equivalence point
with 0.100 M HCl. What is the pH of this solution at the
equivalence point? The titration is:
N2H4 + HCl
N2H5+ + Cl−
2. A 35.00-ml sample of a 0.0870 M solution of ethylamine, C2H5NH2 (Kb = 5.6 x 10), is titrated with 0.150 M HCI. (a) What is the equivalence volume of HCI? (b) Calculate the pH of the solution: (1) prior to the start of the titration. (ii) after addition of 10.15 mL of the 0.150 M HCI. (iii) after addition of 14.50 mL of the 0.150 M HCI. (iv) after addition of 6.00 mL of the HCl beyond the equivalence...
A 22.8 mL sample of 0.242 M ethylamine, C2H5NH2, is titrated with 0.273 M hydrobromic acid. At the equivalence point, the pH is Use the Tables link in the References for any equilibrium constants that are required.
15. Which mixture would be the best butter? a. 1 M HF; 0.01 MF d. 0.1 M HC2H3O2; 0.01 M C2H302 b. 2 M HCI; 0.5 M CI e. 0.003 M HCIO; 0.003 M CIO C. 0.8 M H2C2O4; 0.8 M NaHC204 Thymol Blue 16. Which indicator would be the best for a titration of an hypoiodous acid (HIO), Ka = 2x 10-11 TABLE 16.1 Ranges of Color Changes for Several Acid-Base Indicators a. Crystal violet pH 2 0 3...
4. Two 0.100 M solutions of the weak acids HA and HB are titrated using KOH at 25°C. The pH at equivalence of HA is 8.5, while the pH at equivalence of HB is 10.3. 1. Which of these two acids is weaker? ii. Which of the indicators below would be suitable in the titration of HA? Which would be suitable in the titration of HB? Indicator Alizarin yellow GR phenolphthalein methyl orange methyl red bromothymol blue pH range for...
A 25.0 mL volume of a 0.200 M N2H4
solution (Kb = 1.70 ×
10−6) is titrated to the equivalence point
with 0.100 M HCl. What is the pH of this solution at the
equivalence point? The titration is:
N2H4 + HCl
N2H5+ + Cl−
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