10/05/21

What is the initial concentration of chloric acid?
A 25.00 mL sample of of a chloric acid solution is completely neutralized using 22.44 mL of 0.157 M potassium hydroxide. 
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10/05/21

What is the pH of the solution?
An aqueous solution of base has a concentration of 0.234 M (@ 25 oC).The conjugate acid of the base is known to have a Ka value of 3.82 x 10-7.
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10/05/21

A 0.411 M aqueous solution of weak monoprotic acid (HA) has a pH of 4.504, what is the pKa of the acid dissociation constant?
Please explain how to calculate pKa.
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10/05/21

Of the following, which is the weakest acid?
A. H2SO3 B. H2SO4 C. H2SeO4 D. H2SO3-E. The acid strength of all of the above is the same.
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10/05/21

An aqueous solution of ________ will produce an acidic solution.
A. KNO3 B. NH4NO3C. Na2SO3 D. RbBrE. Mg(ClO4)2 
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10/05/21

A 0.1 M aqueous solution of ________ will have a pH of 7.0 at 25 oC . Na2SO3 NaBr NaClO4 NH4I

A. NaBr and NaClO4 B. NaClO4 onlyC. Na2SO3 onlyD. NH4I onlyE. Na2SO3 and NaBr
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10/04/21

A researcher has attempted to synthesize the molecule (C8H9NO2)shown below, which has the potential to be an active pharmaceutical agent to treat chronic pain.
A researcher has attempted to synthesize the molecule (C8H9NO2)shown below, which has the potential to be an active pharmaceutical agent to treat chronic pain. While analyzing their product, they... more
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10/04/21

Commercial nail polish remover usually consists of a mixture of organic liquids and water. One such formulation contains ethanol
Commercial nail polish remover usually consists of a mixture of organic liquids and water. One such formulation contains ethanol (C2H6O, density = 0.789 g/mL), acetone (C3H6O, density = 0.784... more
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10/04/21

Need to know the formulas and understand it, please
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10/04/21

help me understand calculation

I don´t understand how i will get the procentage I would love to get it described very basic from start so I can start understand the rest of our questions please. Calculate the mass of acetic... more
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10/04/21

Help me understand how i calculate the percentage of mass
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10/04/21

An unknown compound contains only C , H , and O . Combustion of 3.10 g of this compound produced 6.19 g CO2 and 2.54 g H2O . What is the empirical formula of the unknown compound?

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10/04/21

Write the basic equilibrium equation for BrO₃⁻.
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10/04/21

Classify as mixture or pure substance
Classify as mixture or pure substanceA. Gasoline B. Oxygen gas C. Milk D. Mercury (Hg) used in a thermometer E. A tablespoon of sugar (C12H22O11)
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10/04/21

Identify the change as Physical or Chemical
Identify the change as Physical or ChemicalA. Mothballs vaporize in a closet B. A flashlight corrodes on storage.C. A piece of rubber stretches when pulled.D. Alcohol feels cool when it evaporates... more
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10/03/21

Write the balanced chemical equation for the reaction. Include physical states.
Aqueous sodium carbonate reacts with chromium(II) bromide to form aqueous sodium bromide and solid chromium(II) carbonate.Write the balanced chemical equation for the reaction. Include... more
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10/03/21

When 13.7 g Ca(OH)2 reacts with 8.2 g H3PO4, how many grams of Ca3(PO4)2 are produced?
3Ca(OH)2 + 2H3PO4 ---> Ca3(PO4)2 + 6H2O
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10/03/21

My question is about chemistry

Gaseous methane reacts with gaseous elemental sulfur to produce gaseous carbon disulfide and hydrogen sulfide gas.(a) Write the balanced chemical equation. Hint: What is the formula of elemental... more
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10/03/21

Is the answer pH = 8.34, if so I need help with the explaining.

What is the pH of a 0.350 M solution of lithium citrate? (Ka Citric Acid = 7.4 x 10-4)
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10/03/21

Would it be correct if my answer is that it is acidic?
Would you expect a solution of ammonium chloride (NH4Cl) to be acidic or basic when added to water? (Kb NH3 = 1.8 x 10-5)
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10/03/21

I got pH= 1.84, is that correct?
What is the pH of a 1.15 M solution of methanoic acid? Ka = 1.8 x 10-4?
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10/03/21

Not sure if this is correct, but is the answer pH = 4.921
A 50.0 mL solution of 0.150 M acetic acid (CH3COOH) is titrated with 0.150 M NaOH. What is the pH after 20.0 mL of base has been added? Ka CH3COOH = 1.8 x 10-5
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10/03/21

solving for a reacrant using a chemical reaction
Ammonia NH3 chemically reacts with oxygen gas O2  to produce nitric oxide NO and water H2O.What mass of nitric oxide is produced by the reaction of 2.58g of oxygen gas?
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10/03/21

Which formula must be molecular?
Sone of the formulas below could be either empirical or molecular formulas; however, some of them can only be molecular formulas. Which below MUST be a molecular formula?a) C4H9b) C7H14O2c) C2H6d)... more
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10/03/21

Calculate the pH of 100.0 mL of a buffer that is 0.0550 M NH4Cl and 0.150 M NH3 before and after the addition of 1.00 mL of 5.20 M HNO3. _____ = pH before _____= pH after
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