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23 Nov 2019

In each case, indicate which acid or base must be added to create the buffer solution.

Drag the terms on the left to the appropriate blanks on the right to complete the sentences.

P2O5

H3PO3

NH3

CH3CO2H

CH3NH2

CH3CH2OH

HCl

NaHCO3

HCOOH

K2CO3

is used to create the buffer solution with NH4Cl.

is used to create the buffer solution with Na2CO3 .

__ is used to create the buffer solution with NaCH3CO2.

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Sixta KovacekLv2

14 Aug 2019

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Related questions

How many grams of dry NH4Cl need to be added to 2.30 L of a 0.100 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.64? Kb for ammonia is 1.8Ã10â5.

Express your answer with the appropriate units.

Part A

a solution that is 0.175 M in HC2H3O2 and 0.120 M in KC2H3O2

Express your answer using two decimal places.

PH=

Part B

a solution that is 0.195 M in CH3NH2 and 0.110 M in CH3NH3Br

Express your answer using two decimal places.

PH=

A buffer contains significant amounts of ammonia and ammonium chloride.

Part A

Write an equation showing how this buffer neutralizes added acid (HNO3).

Express your answer as a chemical equation.

Part B

Write an equation showing how this buffer neutralizes added base (CsOH).

Express your answer as a chemical equation.

Calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH = 10.20.

Express your answer using two significant figures.

Buffer capacity depends on two quantities. What are they?

a high concentration of conjugate acid molecules in solution and the pH of the solution

an equal number of conjugate acid and base molecules, and a high concentration of each

how close the buffer is to having a 10:1 ratio of the buffer components, and having a high concentration of the components

the range of pH values over which the solution can act as a buffer, and an equal ratio of conjugate acid to conjugate base

A 1.0-L buffer solution is 0.120 M in HNO2 and 0.160 M in NaNO2.

Part A

Determine the concentrations of HNO2 and NaNO2 after addition of 1.7 g HCl.

Express your answers using three significant figures separated by a comma.

Part B

Determine the concentrations of HNO2 and NaNO2 after addition of 1.7 g NaOH.

Express your answers using three significant figures separated by a comma.

Part C

Determine the concentrations of HNO2 and NaNO2 after addition of 1.7 g HI.

Express your answers using three significant figures separated by a comma.

Why is the molar solubility of silver chloride lower in an aqueous solution of sodium chloride than in pure water?

because the presence of extra chloride ion shifts the equilibrium of the AgCl dissolution reaction toward the undissociated silver chloride

because solubility relies on concentrations of all the species in the dissolution reaction equation, and lower solubility means higher amounts of solid silver chloride

because silver ions and sodium ions form a completely insoluble precipitate and fall out of the solution

because sodium chloride takes up all the water and doesn't leave any interactions for the silver chloride, causing reduced solubility

In which of the following would lead sulfate be most soluble?

	1 M NaNO3
	1 M H2SO4
	1 M Pb(NO3)2
	1 M CuSO4

Hey, I am a little lost on this problem. Can someone help?

Observations In columns 3 and 4, record the color and intensity seen. In columns 5 and 6, determine if the substance is an acid or a base, and if the substance is ionic. For the last column, determine which chemical species is acting as an acid or base.

Data Table 1: Acids and Bases Acting in Water
Well	Substance	1drop BTB	Plus 1 drop of substance	Acid or base (Q1)	Ionic? Y/N (Q2)	Species acting as acid or base (Q3)
1	NaHCO3
2	CH3COOH
3	HCL
4	Na2CO3
5	H2SO4
6	CH3COONa
7	NaOH
8	HNO3
9	NaHSO4
10	NH3
11	H3PO4
12	NaH2PO4
13	Na2HPO4
14	Na3PO4
15	NaHSO3

Data Table 2: Following Acid/Base neutralization reactions
Well #	1 Drop of Each	Observation	+2 Drops Acid	Observation	+2 Drops Base	Observation
1	BPB + NaOH		HCl		NaOH
2	BPB + NaOH		H2SO4		NaOH
3	BPB + NaOH		CH3COOH		NaOH
4	BPB + NaOH		H3PO4		NaOH
5	BPB + Ca(OH)2		HCl		Ca(OH)2
6	BPB + Ca(OH)2		H2SO4		Ca(OH)2
7	BPB + Ca(OH)2		CH3COOH		Ca(OH)2
8	BPB + Ca(OH)2		H3PO4		Ca(OH)2
9	BPB + NH3		HCl		NH3
10	BPB + NH3		H2SO4		NH3
11	BPB + NH3		CH3COOH		NH3
12	BPB + NH3		H3PO4		NH3

Please note here if any of the other starting materials is other than a clear, colorless solution.

Data Table 3: Investigating Odor as a Means of Indicating Neutralization.
Substance(s)	Odor
2 Drops of HCl in Well #1
1 Drop of Ammonia on Swab
Swab with Ammonia & HCl

Data Table 4: Investigating Evaporation as a Means of Indicating a Neutralization Reaction.
Reaction Mixture	Observation (When Wet)	Observation (When Dry)
HCl + NaOH
CH3COOH + NH3
HNO3 + NaOH

PART 5: Mini-Experiments

1. Use BTB to classify four household products as acidic or basic. Possible substances to test include home cleaning products, glass cleaner, liquid detergent, bleach, soft drinks, liquid from food items, etc. Remember to:

a. Hypothesis (What you think will happen and why) or purpose:

b. Method used to test your hypothesis:

c. Data and Observations Put your data and observations in the space below. You can include pictures that you âdraw.â

d. Conclusions

2. Find one common, highly colored substance that can be used as an acid-base indicator.

Possible substances include fruit/vegetable juice or products, inks, food coloring, flower

petals, etc. If using fresh fruit, veggies, or flowers, crush the substance with a little water or

rubbing alcohol to extract the colored pigments. If red cabbage is available, it makes a superb

acid-base indicator. Then use a few drops of the colored extract as the indicator. Test four

more household products using the freshly made acid-base indicator. Remember to:

a. State a hypothesis or purpose.

b. State the testing method.

c. Use the prepared indicator to test four substances known to be acids or bases from either the LabPaq or home materials and record results.

d. State conclusions in terms of the hypothesis or purpose.

Questions

A. Review the substances used in Part 1. Determine whether each substance contains an acid or a base based on the BTB results. Place answers to this question in column 6 of Data Table 1.

B. Review the responses to Question 3. The anion that is produced in the dissociation of the compound goes on to react with the water. Identify the anion product in each reaction. Place the formulas for these species into column 7 of Data Table 1. If the substance is not ionic and thus does not dissociate, then list the substance in column 7, just as it appears in column 1.

C. For each ionic species in Data Table 1, write the equation showing the dissociation of the compound in water. Hint: thereâs one for each line provided below.

a. NaHCO3 Ã Na

+ HCO3

Review the responses to Question 3. The anion that is produced in the dissociation of the compound goes on to react with the water. Identify the anion product in each reaction. Place the formulas for these species into column 7 of Data Table 1. If the substance is not ionic and thus does not dissociate, then list the substance in column 7, just as it appears in column 1.

D. Write the reaction of each acid or base the substance listed in column 7 with water.

Acids: Bases:

a) HCO - + H-OH Ã H CO

+ OH-

3 2 3

1. What is produced in each and every reaction of an acid with water?

2. What is produced in each and every reaction of a base with water?

E. Review the results in Data Table 2. For each reaction mixture, write the reaction equation describing the acid/base neutralization reaction:

2) 2NaOH + H2SO4 Ã 2H2O + Na2SO4

F. Define the term âneutralizationâ and provide an example of a neutralization equation. List the three ways used in this lab to detected neutralization.

G. Define the term âsalt,â and provide an example.

H. Review Data Table 3. What happened when the two chemicals were mixed? What indicates that conclusion? What reaction took place?

I. Review Data Table 4. What happened when the solution mixtures on the glass slide were heated? Describe the process that took place.

J. In Part 4, for HCl + NaOH, what is left on the slide after heating? Provide the formula. What is the common name of this substance?

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