25,963 Answered Questions for the topic chemistry

Chemistry

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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Chemistry

11/02/23

Identify each of the following as a strong or weak acid
S2-, SO32-, Cl- ,Br-,NO3-, ClO4-, CO32-, and PO43-
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Chemistry

11/02/23

Identify each of the following compounds as either a strong acid, weak acid, strong base, or weak base.

The compounds are as follows: HNO3, HBr, H2CO3, HF, NH4Cl, K2SO3, KOH, RbOH, and (CH3)3N
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Chemistry

11/02/23

Complete and balance the equations according to acid and base behavior in water.

Complete and balance the equations according to acid and base behavior in water. Phases are optional. H2OHNO3(aq)-----> H2OBa(OH)2... more
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Chemistry

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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Chemistry

11/02/23

Complete these Bronsted-Lowry reactions.
Complete these Bronsted-Lowry reactions.Reaction 1: HPO^2-/4 +H+ ⇌ ?Reaction 2: HPO^2-/4 +OH- ⇌?
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Chemistry

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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Chemistry

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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Chemistry

11/02/23

Complete the autoionization reaction for water.
Complete the autoionization reaction for water.Autoionization of water: H2O+H2O ⇌
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Chemistry

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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Chemistry

11/02/23

A 2.0 mole sample of H3PO4(aq) reacts with KOH(aq) and produces K3PO4(aq) and H2O(l).how many moles of KOH react with H3PO4 and how many moles of K3PO4 and H2O are produced?
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Chemistry

11/02/23

Calculate the pH of a solution containing a 1.00:4.00 mole ratio of HC^2-:C^3- (H3C=citric acid). The ionic strength is 0.010M. The pka values for citric acid are 3.13,4.76,6.40.

What will be the pH if the ionic strength is raised to 0.10M and the mole ratio HC^2-:C^3 is kept constant?
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Chemistry

11/02/23

I cant seem to get this after doing a couple easier examples.
The rate constant for the first-order conversion of A to B is 3.33 hr⁻¹. How much time will be required for the concentration of A to reach 75% of its original value?
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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

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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Chemistry

11/02/23

Gas law questions
How many moles of gas are in 275mL containers with 1.00 atm at 73C? What is the molar mass of the gas that is condensed into 0.697g of the liquid?
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Chemistry

11/02/23

Inviting my son
Hi -- I have set up this account to schedule tutoring for my son. How do I transfer the account over to my son, so he can schedule and login himself? Thanks
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Chemistry

11/02/23

Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow.

Be sure to include the proper phases for all species within the reaction.C2H3O2 (aq) + Sr (OH)2 (aq) =
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Chemistry

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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Chemistry

11/01/23

In a dilute sodium bicarbonate solution, H+ =1.9*10^-8M. Without using a calculator, what integer value will this pH be near? Calculate the pH.

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Chemistry

11/01/23

What is the equation for the dissociation of the weak acid HBrO4 in water.
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Chemistry

11/01/23

H2SO3 is a diprotic acid with Ka1= 1.39*10^-2 and Ka2=6.73*10^-8. Determine the pH of a 0.211M sulfurous acid H2SO3 solution.

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