Homework Answers
Correct answer is A, to change colour of phenophthalein base must be strong because it get completely ionised and reacts with phenophthalein too as it is weak organic acid.
So correct answer is A.
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Which of the following is the acid-base combination that cannot use phenolphthalein as an acid-base indicator?...
Define an acid-base indicator. Explain why phenolphthalein is chosen as an indicator for the titration for...
Define an acid-base indicator. Explain why phenolphthalein is chosen as an indicator for the titration for standardizing NaOH, determining % composition of KHP, and determining the acid content of vinegar. (Look up for the Ka for the indicator online and explain why this indicator is chosen for these titrations)
4. Phenolphthalein is an acid-base indicator. indicator (cite your source: textbook, webite, etc....
4. Phenolphthalein is an acid-base indicator. indicator (cite your source: textbook, webite, etc.) Describe the general properties of an acid-base 5. Consider the following reaction at equilbrium: Explain the effect of increasing the concentration of Ni gas on the concentration of the reactants and products when a new equilibrium is reached. Indicate which concentrations will be increased and which concentrations will be decreased when a new equilbrium is reached. Na: Increased or decreased 02: Increased or decreased NO: Increased or...
Determination of the Molarity of an Acid or Base Solution Select Type of Reaction Strong Acid...
Determination of the Molarity of an Acid or Base Solution Select Type of Reaction Strong Acid vs Strong Base Weak Acid vs Strong Base Fill the Burette with Acid Base KOH Total Volume of Base 18.74 ml Acid Select the acid and base HCI H_2SO_4 HNO_3 HCIO_4 Base KOH NaOH Sr(OH)_2 Ba(OH)_2 Select the Indicator Methyl Orange Phenolphthalein Push Slider Up to Add a Volume of Base 17.5 ml After Titration, Calculate and Enter Molarity of Base 5.
5. Write an acid-base equation for the following pairs of compounds: a. HF and HCI b....
5. Write an acid-base equation for the following pairs of compounds: a. HF and HCI b. NaOH and NH3 C. HCl and NaOH d. CH3COOH and NH3 e. NH4CI and NH3
8. Which one of the following substances is not a base? a) KOH b) Ca(ОН)2 c)...
8. Which one of the following substances is not a base? a) KOH b) Ca(ОН)2 c) NH3 d) HNO3 e) Cl 9. Which of the following species is NOT soluble? (a) Na2S (b) Рb(ОН)2 (c) KNO3 (d) KCl (e) (NH4)2CO3 10. Which of the following is a weak acid? a) HBr b) HCl c) NH3 d) HCIO4 e) HF
2) Which one of the following pairs cannot be mixed together to form a buffer solution?...
2) Which one of the following pairs cannot be mixed together to form a buffer solution? A) NaC2H302, HCI (C2H302 = acetate) B) H3PO4, KH2P04 C) NH3, NH4CI D) RbOH, HBr E) KOH, HE
6 Which of the following chemical equations is an example of an acid-base reaction? ed Select...
6 Which of the following chemical equations is an example of an acid-base reaction? ed Select one: a. 2 HCl (aq) +Po(NO)2 (aq) PbC2 (s)+2 HNOs (aq) b. HF (aq) NH3 (ag) NH&F (aq) c. 2 HCl (aq) + Zn (s) → H2 (g) + ZnCl2 (aq) d. Ba(OH)2 (aa) + K2S04 (aq) → Baso, (s) + 2 KOH (aq) e. 3 NaOH (aq) + AIClg (aa)-Al(OH)3 (s) + 3 NaCl (aq) out of ag ion
Which of the following cannot be a buffer solution? Group of answer choices 1.0-L solution, in...
Which of the following cannot be a buffer solution? Group of answer choices 1.0-L solution, in which 0.10 mol acetic acid (CH3COOH) and 0.050 mol potassium hydroxide (KOH) are dissolved. 0.50-L solution, in which 0.25 mol ammonia (NH3) and 0.18 mol hydrochloric acid (HCl) are dissolved. 0.75-L solution, in which 1.0 mol hydrofluoric acid (HF) and 2.0 mol sodium hydroxide (NaOH) are dissolved. 1.0-L solution, in which 3.0 mol lithium hydroxide (LiOH) and 5.0 mol formic acid (HCOOH) are dissolved....
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is...
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is to indicate the of the titration. Use Table 10.2 for the following question. If an acidic solution is titrated with a basic solution and methyl violet is used as an indicator, the solution color will change from to QUESTION 2 3 points Save Answer The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCI (aq) in 133 mL of water...
Assume an indicator works best when the equivalence point of a titration comes in the middle...
Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. For which of the following titrations would methyl red be the best indicator? The pH range of methyl red is 4.8 to 6.0. Select one: a. 0.100 M NH3 (Kb = 1.8 × 10–5) + 0.100 M HCl b. 0.100 M Sr(OH)2 + 0.100 M HI c. 0.100 M HF (Ka = 7.2 × 10–4) + 0.100 M NaOH d....
4. Phenolphthalein is an acid-base indicator. indicator (cite your source: textbook, webite, etc.) Describe the general properties of an acid-base 5. Consider the following reaction at equilbrium: Explain the effect of increasing the concentration of Ni gas on the concentration of the reactants and products when a new equilibrium is reached. Indicate which concentrations will be increased and which concentrations will be decreased when a new equilbrium is reached. Na: Increased or decreased 02: Increased or decreased NO: Increased or...
Determination of the Molarity of an Acid or Base Solution Select Type of Reaction Strong Acid vs Strong Base Weak Acid vs Strong Base Fill the Burette with Acid Base KOH Total Volume of Base 18.74 ml Acid Select the acid and base HCI H_2SO_4 HNO_3 HCIO_4 Base KOH NaOH Sr(OH)_2 Ba(OH)_2 Select the Indicator Methyl Orange Phenolphthalein Push Slider Up to Add a Volume of Base 17.5 ml After Titration, Calculate and Enter Molarity of Base 5.
5. Write an acid-base equation for the following pairs of compounds: a. HF and HCI b. NaOH and NH3 C. HCl and NaOH d. CH3COOH and NH3 e. NH4CI and NH3
8. Which one of the following substances is not a base? a) KOH b) Ca(ОН)2 c) NH3 d) HNO3 e) Cl 9. Which of the following species is NOT soluble? (a) Na2S (b) Рb(ОН)2 (c) KNO3 (d) KCl (e) (NH4)2CO3 10. Which of the following is a weak acid? a) HBr b) HCl c) NH3 d) HCIO4 e) HF
2) Which one of the following pairs cannot be mixed together to form a buffer solution? A) NaC2H302, HCI (C2H302 = acetate) B) H3PO4, KH2P04 C) NH3, NH4CI D) RbOH, HBr E) KOH, HE
6 Which of the following chemical equations is an example of an acid-base reaction? ed Select one: a. 2 HCl (aq) +Po(NO)2 (aq) PbC2 (s)+2 HNOs (aq) b. HF (aq) NH3 (ag) NH&F (aq) c. 2 HCl (aq) + Zn (s) → H2 (g) + ZnCl2 (aq) d. Ba(OH)2 (aa) + K2S04 (aq) → Baso, (s) + 2 KOH (aq) e. 3 NaOH (aq) + AIClg (aa)-Al(OH)3 (s) + 3 NaCl (aq) out of ag ion
QUESTION 1 6 points Save Answer The purpose of an indicator in an acid-base titration is to indicate the of the titration. Use Table 10.2 for the following question. If an acidic solution is titrated with a basic solution and methyl violet is used as an indicator, the solution color will change from to QUESTION 2 3 points Save Answer The molarity of a solution prepared by dissolving 17.0 g of hydrochloric acid (HCI (aq) in 133 mL of water...
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