10/26/20

What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.100 mol of NaOH were added?
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10/26/20

What is the pH of a buffer made from 0.210 mol of HCNO (Ka = 3.5 × 10⁻⁴) and 0.410 mol of NaCNO in 2.0 L of solution?
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10/26/20

Identify the conjugate acid of H2PO4 and then the conjugate base of H2PO4+
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10/26/20

Dilution problem
For this lab we will dilute by factors of 10. Clearly indicate (often a table is best) how you generated each concentration of drug. Our stock solution is 10% and we need 100ml of acetylcholine at... more
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10/26/20

Calculate the speed of light if a wave has a wavelength of 7.32 x 10-7 m and a frequency of 4.10 x 1014 1/s.
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10/26/20

phase change energetics
The following information is given for mercury, Hg, at 1 atm: boiling point = 357 °C Hvap(357 °C) = 59.3 kJ/mol melting point = -38.9 °C Hfus(-38.9 °C) = 2.33 kJ/mol specific heat... more
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10/25/20

If a solid line represents a covalent bond and a dotted line represents intermolecular attraction, which of the choices shows a hydrogen bond?
If a solid line represents a covalent bond and a dotted line represents intermolecular attraction, which of the choices shows a hydrogen bond?a) H4C......H-FB) H3N......H-O-HC) H2O⋅⋅⋅⋅⋅⋅H−CH3D)H−H
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10/25/20

constant volume caliometry
What is ΔE for the reaction, in units of kJ/mol?1.11 × 10-3 mol sucroseΔT = 2.14 °Cqwater = 5.37 kJqcal = 0.898 kJ
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10/25/20

constant volume caliorimetry
A 1.16-g sample of L-ascorbic acid (C6H8O6) is burned in a bomb calorimeter and the temperature increases from 25.10 °C to 28.10 °C. The calorimeter contains 1.04×103 g of water and the bomb has a... more
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10/25/20

find mass and stp
What mass of Neon gas is required to fill an "OPEN" sign if the tube has a volume of 669.1 mL and is filled at STP. Assume ideal gas behavior, and that the gas filling the sign is 100% neon.
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10/25/20

find percent yield
What is the percent yield of a reaction between 25.0 mL of 0.541 M silver nitrate and 10.0 mL of 3.00 M hydrobromic acid (HBr) if 1.31 grams of silver bromide are produced?
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10/25/20

Question in the description

Experimentally, you can monitor conductivity of a solution to prove the presence of ions in solution.Consider the reaction of sulfuric acid, H2SO4, a strong acid, with barium hydroxide, Ba(OH)2, a... more
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10/25/20

Question in the Description

Phosphate can be removed from drinking water supplies by treating the water with Ca(OH)2. How much Ca(OH)2(s) is required to remove 90% of the PO4 3− from 4.5 × 106L of drinking water containing 25... more
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10/25/20

What is the net reaction of the reaction series below?

3 CO2(g) + 4 H2O(g) -----> C3H8(g) + 5 O2(g)3 C(s) + 3 O2(g) -----> 3 CO2(g)4 H2(g) + 2 O2(g) -----> 4 H2O(g)
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10/25/20

scenario question

1. Which laboratory terminology best describes the following scenario:"When aqueous solutions of sodium carbonate and nickel (II) chloride were combined, the solution became cloudy"a. Human Errorb... more
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10/24/20

Acid-Base Mixing and Titrations
Consider the titration of 45.0 mL of 0.117-M of KX with 0.147-M HCl. The pKa of HX = 10.07. Give all pH values to 0.01 pH units.I have the pH of original solution before adding acid at 11.56 and ml... more
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10/24/20

Chemistry Matter
Ted used a balance scale to weigh a 2.233 g sample of copper sulfate. Which of these measurements made by Ted is the most accurate?2.1 g 2.2 g 2.4 g 2.5 g
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10/24/20

Solution Stoichiometry
How many grams of Ag2CO3 will precipitate when excess (NH4)2CO3 solution is added to 63.0 mL of 0.763 M AgNO3 solution?2AgNO3(aq) + (NH4)2CO3(aq) Ag2CO3(s) + 2NH4NO3(aq)
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10/24/20

Titration: Molarity of Acid or Base
An aqueous solution of barium hydroxide is standardized by titration with a 0.166 M solution of perchloric acid.If 22.2 mL of base are required to neutralize 13.4 mL of the acid, what is the... more
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10/24/20

Dilution: Moles to Volume
You wish to make a 0.240 M hydrochloric acid solution from a stock solution of 12.0 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 175 mL of the dilute... more
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10/24/20

Titration: Molarity of Acid or Base
An aqueous solution of hydrochloric acid is standardized by titration with a 0.175 M solution of calcium hydroxide.If 25.3 mL of base are required to neutralize 16.4 mL of the acid, what is the... more
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10/24/20

Titration: Molarity of Acid or Base
An aqueous solution of potassium hydroxide is standardized by titration with a 0.196 M solution of hydrochloric acid.If 21.9 mL of base are required to neutralize 25.0 mL of the acid, what is the... more
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10/24/20

Coffee cup calorimeter with a heat capacity of 3.60j
A coffee cup calorimeter with a heat capacity of 3.60 J/∘C was used to measure the change in enthalpy of a precipitation reaction. A 50.0 mL solution of 0.330 M AgNO3 was mixed with 50.0 mL of... more
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10/24/20

Combustion Analysis
When 6.508 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 20.42 grams of CO2 and 8.361 grams of H2O were produced.In a separate experiment, the molar mass of the... more
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10/24/20

mixing solutions together
What would you observe when mixing these two solutions together? Lye and Epsom Salt
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