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Which of the following statements about...
please show me how to answer these 13. Which of the following combinations would be best...
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13. Which of the following combinations would be best to buffer an aqueous solution at a pH of 2.0? a. H3PO4 and H2PO4, Kat = 7.5 x 103 b. HNO2 and NO2, Ka 4.5 x 10 c. CH3COOH and CH3COO, Ka 1.8 x 105 d. H2PO and HPO 2, Ka2 6.2x 10 14. Molecules or ions that can alternately behave as either a Bronsted-Lowry acid or base are called a. polyanions b. hydronium...
22. Which of the following substances, when added to water, will produce a solution with a pH abo...
22. Which of the following substances, when added to water, will produce a solution with a pH above 7.0? A. NHaCİ B. CHsNHCl C. NH4NO3 D. HOCİ E. NaoCi 23. The following acids are listed in order of decreasing acid strength in water.HI> HNO2> CH,COOH> HOCI HCN. According to Bronsted-Lowry theory, which of the following ions is the weakest base? A. I B. NO. C. CHCOo D. ocT E. CN 24. The following reaction is described as: H2S + H2S...
2. Answer the following questions about phosphoric acid (H3PO4). a. (2 points) What color will a...
2. Answer the following questions about phosphoric acid (H3PO4). a. (2 points) What color will a 0.1 M solution of H3PO4 turn blue litmus paper? b. (2 points) What color will a 0.1 M solution of H3PO4 turn red litmus paper? c. (2 points) What color will phenolphthalein be in a 0.1 M solution of H,POA? d. (5 points) Write an equation for the reaction that takes place when phosphoric acid is added to water e. (4 points) What is...
Hey guys, I am having a lot of trouble with my homework. Could you please help?...
Hey guys, I am having a lot of trouble with my homework. Could
you please help? I thumbs up anyone who gives a thorough
explanation and shows the work! I really need to understand these
concepts!
Thank you very much!
1) Z- is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is: 2) The base-ionization constant of ethylamine (C2H5NH2) is 6.4 x 10-4...
Hey guys, I am having a lot of trouble with my homework. Could you please help?...
Hey guys, I am having a lot of trouble with my homework. Could
you please help? I thumbs up anyone who gives a thorough
explanation and shows the work! I really need to understand these
concepts!
Thanks guys!
1) Z- is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is: 2) The base-ionization constant of ethylamine (C2H5NH2) is 6.4 x 10-4 at 25.0...
Hey guys, I am having a lot of trouble with my homework. Could you please help?...
Hey guys, I am having a lot of trouble with my homework. Could
you please help? I thumbs up anyone who gives a thorough
explanation and shows the work! I really need to understand these
concepts!
Thank you!
1) Z- is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is: 2) The base-ionization constant of ethylamine (C2H5NH2) is 6.4 x 10-4 at 25.0...
Which of the following statements is/are correct? I. A Brønsted base is a hydrogen ion donor....
Which of the following statements is/are correct? I. A Brønsted base is a hydrogen ion donor. II. Acids produce hydronium ions in water. III. In an aqueous solution of a strong acid, HA(aq), the hydronium ion concentration is approximately equal to the initial concentration of the acid [H3O+] = [HA]). I only I, II, and III II only II and III III only
Determine the following. Please show your work II calculations, each correct, but unsupported answer is only...
Determine the following. Please show your work II calculations, each correct, but unsupported answer is only worth 1 pont 31) The following equation describes ollowing equation describes the neutralization of phosphoric acid by the addition of potassium + hydroxide in aqueous solution: HPO4 3 KOH 3 H2O K3PO4 + If it takes 45.0 mL of 1.500 M KOH to neutralize 180,0 mL of a given H3PO4 So molarity of this phosphoric acid solution? [7 points] alize 180.0 mL of a...
I need the explanation for why is this the answer ! please. And answer the other...
I
need the explanation for why is this the answer ! please. And
answer the other ones if you can.
3) If a species contains 23% A in its DNA, what is the percentage of guanine it would contain? A)23% B)46% C)25% D)44% E)27% 4) A nucleotide contains ADNA and RNA. Ba sugar and a phosphate. C)complementary purines and pyrimidines. D)RNA, protein, and lipids. E)a sugar, a phosphate, and a nitrogen-containing base. 5) In the Watson-Crick model of DNA, the...
0, Which of the statements below about an acid-base buffer solution is/are true? IIt can be...
0, Which of the statements below about an acid-base buffer solution is/are true? IIt can be prepared by combining a strong acid with a salt of its conjugate base VII. It can be prepared by combining a weak acid with a salt of its conjugate base IID It can be prepared by combining a weak base with its conjugate acid V. The pH of a buffer solution does not change when the solution is diluted. A buffer solution resists changes...
please show me how to answer these
13. Which of the following combinations would be best to buffer an aqueous solution at a pH of 2.0? a. H3PO4 and H2PO4, Kat = 7.5 x 103 b. HNO2 and NO2, Ka 4.5 x 10 c. CH3COOH and CH3COO, Ka 1.8 x 105 d. H2PO and HPO 2, Ka2 6.2x 10 14. Molecules or ions that can alternately behave as either a Bronsted-Lowry acid or base are called a. polyanions b. hydronium...
22. Which of the following substances, when added to water, will produce a solution with a pH above 7.0? A. NHaCİ B. CHsNHCl C. NH4NO3 D. HOCİ E. NaoCi 23. The following acids are listed in order of decreasing acid strength in water.HI> HNO2> CH,COOH> HOCI HCN. According to Bronsted-Lowry theory, which of the following ions is the weakest base? A. I B. NO. C. CHCOo D. ocT E. CN 24. The following reaction is described as: H2S + H2S...
2. Answer the following questions about phosphoric acid (H3PO4). a. (2 points) What color will a 0.1 M solution of H3PO4 turn blue litmus paper? b. (2 points) What color will a 0.1 M solution of H3PO4 turn red litmus paper? c. (2 points) What color will phenolphthalein be in a 0.1 M solution of H,POA? d. (5 points) Write an equation for the reaction that takes place when phosphoric acid is added to water e. (4 points) What is...
Hey guys, I am having a lot of trouble with my homework. Could
you please help? I thumbs up anyone who gives a thorough
explanation and shows the work! I really need to understand these
concepts!
Thank you very much!
1) Z- is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is: 2) The base-ionization constant of ethylamine (C2H5NH2) is 6.4 x 10-4...
Hey guys, I am having a lot of trouble with my homework. Could
you please help? I thumbs up anyone who gives a thorough
explanation and shows the work! I really need to understand these
concepts!
Thanks guys!
1) Z- is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is: 2) The base-ionization constant of ethylamine (C2H5NH2) is 6.4 x 10-4 at 25.0...
Hey guys, I am having a lot of trouble with my homework. Could
you please help? I thumbs up anyone who gives a thorough
explanation and shows the work! I really need to understand these
concepts!
Thank you!
1) Z- is a weak base. An 0.350 M aqueous solution of NaZ is prepared. The pH of the solution was 8.93 at 25.0°C. The Kb of Z- is: 2) The base-ionization constant of ethylamine (C2H5NH2) is 6.4 x 10-4 at 25.0...
Determine the following. Please show your work II calculations, each correct, but unsupported answer is only worth 1 pont 31) The following equation describes ollowing equation describes the neutralization of phosphoric acid by the addition of potassium + hydroxide in aqueous solution: HPO4 3 KOH 3 H2O K3PO4 + If it takes 45.0 mL of 1.500 M KOH to neutralize 180,0 mL of a given H3PO4 So molarity of this phosphoric acid solution? [7 points] alize 180.0 mL of a...
I
need the explanation for why is this the answer ! please. And
answer the other ones if you can.
3) If a species contains 23% A in its DNA, what is the percentage of guanine it would contain? A)23% B)46% C)25% D)44% E)27% 4) A nucleotide contains ADNA and RNA. Ba sugar and a phosphate. C)complementary purines and pyrimidines. D)RNA, protein, and lipids. E)a sugar, a phosphate, and a nitrogen-containing base. 5) In the Watson-Crick model of DNA, the...
0, Which of the statements below about an acid-base buffer solution is/are true? IIt can be prepared by combining a strong acid with a salt of its conjugate base VII. It can be prepared by combining a weak acid with a salt of its conjugate base IID It can be prepared by combining a weak base with its conjugate acid V. The pH of a buffer solution does not change when the solution is diluted. A buffer solution resists changes...
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