11/03/23

Acid Rain and Buffers

In the Midwest, the natural geologic formation are typically made of limestone ( CaCO3). The limestone in the Midwest provides the lakes and soils with a natural buffer. The questions beloiw... more
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11/03/23

Chemistry molar solubility, common ion effect
Calculate the molar solubility of Ca3(PO4)2{ ksp= 1.99x10^-29} in a solution containing 0.325 M K3PO4 ?(To the tutor who helped me with this problem with me last time, I think some of your... more
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11/03/23

How many moles of NiCl2 N i C l 2 can be formed in the reaction of 8.00 mol m o l of Ni N i and 16.0 mol m o l of HCl H C l ?
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11/03/23

What is the minimum mass of Mg(NO₃)₂ that must be added to 1.00 L of a 0.760 M HF solution to begin precipitation of MgF₂(s)? For MgF₂, Ksp = 7.4 × 10⁻⁹, and Ka for HF = 7.2 × 10⁻⁴.
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11/03/23

find the ratio for the solution

What ratio of CH₃NH₂ to CH₃NH₃⁺ is needed to prepare a pH 10.00 buffer? (Kb for CH₃NH₂ is 4.4 × 10⁻⁴)
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11/03/23

chem find the mol for a solution

To a 400 mL solution of 0.5 M acetic acid (Ka = 1.75× 10⁻⁵), you add 0.1 moles of KOH to prepare a buffer solution. If you then mix in 100 mL of 0.3 M HCl, what will the final pH be? Hint: the... more
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11/03/23

PH chemistry solutions

What quantity in moles of CH₃NH₃Cl need to be added to 200.0 mL of a 0.500 M solution of CH₃NH₂ (Kb for CH₃NH₂ is 4.4 × 10⁻⁴) to make a buffer with a pH of 11.00?
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11/03/23

Calculate the molar solubility(s)
Calculate the molar solubility of Ca3(PO4)2 { ksp= 1.99x10^-29} in a solution containing 0.325 M K3PO4 ?Calculate the molar solubility of Cu3(AsO4)2, { ksp= 7.57x10^-36} in a solution of... more
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11/03/23

Calculate the concentration of buffer components present

Calculate the concentration of buffer components present in 275.00 mL of a buffer solution that contains  0.240 M  NH4Cl and 0.240 M  NH3 immediately after the addition of 1.90 mL of... more
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11/03/23

How much 10.0 M HNO3 must be added to 1.00 L of a buffer that is 0.0100 M acetic acid and 0.100 M sodium acetate to reduce the pH to 5.30 ?
Acetic acid and its conjugate base acetate can form an acid-base buffer.  The pKa of acetic acid is 4.75.
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11/03/23

A buffer is prepared by mixing 25.2 mL of 0.183 M NaOH with 144.3 mL of 0.231 M acetic acid. What is the pH of this buffer?
An acid–base buffer is able to resist changes in pH due to the addition of small amounts of strong acid or base to the system. An acid–base buffer typically contains a weak acid and its conjugate... more
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11/03/23

What is the pH of a solution made by dissolving 3.56 grams of calcium fluoride in enough water to make 360 mL of solution?
The Ka for HF is 6.80x10–4.
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11/02/23

Calcium carbonate is a common ingredient in antacids that reduces the discomfort associated with acidic stomach or heartburn. Stomach acid is hydrochloric acid, HCl.

What volume in milliliters of an HCl solution with a pH of 1.81 can be neutralized by 17.0mg of CaCO3? What percentage of the acid is neutralized? If all of the acid is neutralized enter 100%
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11/02/23

Calculate the hydroxide ion concentration, [OH-], for a solution with a pH of 7.07.
Calculate the hydroxide ion concentration, [OH-], for a solution with a pH of 7.07.[OH-] = ?M
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11/02/23

Calculate the concentration of the HCl solution.

By titration, it is found that 85.5 mL of 0.177 M NaOH(aq) is needed to neutralize 25.0mL of HCl(aq). Calculate the concentration of the HCl solution. [HCl]=?M
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11/02/23

Complete the autoionization reaction for water.
Complete the autoionization reaction for water.Autoionization of water: H2O+H2O ⇌
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11/02/23

Complete the equation

Complete the equation to show the pyridine C5H5N , acts as a Bronsted- Lowry base in water. equation: C5H5N+ H2O⇌ ?
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11/02/23

Calculate the pH of a solution made from 0.0473 mol NaOH added to 1.00L of pure water. Assume no volume changes.

Calculate the pH of a solution made from 0.0473 mol NaOH added to 1.00L of a buffer containing 0.116 mol each of a weak acid (pka=4.66) and its conjugate base. Assume no volume changes.
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11/02/23

I can't seem to get this one, could I get some help please?
The half-life for the first-order conversion of A to B is 56.5 hours. How long does it take for the concentration of A to decrease to 10.0% of its original concentration?
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11/02/23

We tried a few of these but I can't seem to get this one
A first order reaction initially contains 2.25 × 10²⁰ molecules. If the reaction has a half-life of 20.0 minutes, how many molecules remain unreacted after 80.0 minutes?
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11/02/23

What is the rate constant of a first-order reaction if the half-life is 5.62 min?
I cant seem to get this one, even though i did others.
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11/02/23

Bromine monochloride is synthesized using the reaction Br2(g)+Cl2(g)↽−−⇀2BrCl(g) 𝐾p=1.1×10−4 at 150 K. A 196.0 L flask initially contains 1.097 kg of Br2 and 1.041 kg Cl2 .

Bromine monochloride is synthesized using the reaction Br2(g)+Cl2(g)↽−−⇀2BrCl(g) 𝐾p=1.1×10−4 at 150 K. A 196.0 L flask initially contains 1.097 kg of Br2 and 1.041 kg Cl2 . Calculate the mass of... more
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11/02/23

A chemist mixes 48.8 g of carbon tetrachloride with 2.91 g of isopropenylbenzene and 7.04 g of 2-ethyltoluene. Calculate the percent by mass of each component of this solution.
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10/31/23

question is in the description
Suppose 0.850 L of 0.400 M H2SO4 is mixed with 0.800 L of 0.250 M KOH. What concentration of sulfuric acid remains after neutralization
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10/31/23

How many (mm) of 2.00 M HCL are required to react with 4.55 g Zn?
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