10/31/23

Question is in the description

A flask contains 10.0 mL of HCL and a few drops of phenolphthalein indicator. The buret contains 0.250 M NaOH. It requires 30.3 mL of the NaOhH solution to reach the end point of the titration.... more
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10/31/23

what mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.100 L 0.240 M NaI assume reaction goes to completion

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10/31/23

If 4.50 g of HCl are reacted with 15.00 g of CaCO3, according to the following balanced chemical equation, calculate the theoretical yield of CO2

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10/31/23

What would be the molar mass of a gas with pressure 22336.4 mm of Hg; 25.5L at 59 degrees C with a mass of 880g? Gas constant is 0.0821 L.atm/mol.K
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10/30/23

finding n=f for a ground state
a ground state of hydrogen atom absorbs a photon of light having a wavelength of 92.27nm. it gives off a photon having a wavelength of 922.7nm. what is the final state of hydrogen atom? nf=
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10/29/23

What is the maximum concentration of Ag⁺ that can be added to a 0.00300 M solution of Na₂CO₃ before a precipitate will form? (Ksp for Ag₂CO₃ is 8.10 × 10⁻¹²)
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10/29/23

buffer solution preparing
Prepare:100 mL of 0.15 M sodium acetate buffer, pH 4.6 + 0.9 w/v%. NaCl (you have 0.25 M sodium acetate buffer, pH 4.6 & 9% w/v NaCl solutions.)
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10/29/23

buffer solutions

Prepare 50 mL of 0.1 M acetate buffer, pH 4.6 (by diluting stock solution: 0.25 M sodium acetate buffer, pH 4.6)
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10/29/23

Drug dissolved in DMSO question
I need to make a 1000x stock solution from 1g of MPTP. This stock solution has to be stored in a 1ml eppendorf tube. I want to have a 7.5M stock solution that I can dilute down to 7.5mM when... more
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10/28/23

molar ratio, buffer
9. What is the molar ratio [A- / HA] of Na acetate (base) to acetic acid (acid) for a buffer with a pH of 6.4 and a pKa of 6.9?
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10/28/23

Solving limiting reactant problems in solution
Suppose 2.77g of iron(II) iodide is dissolved in 200.mL of a 68.0 m M aqueous solution of silver nitrate. Calculate the final molarity of iron(II) cation in the solution. You can assume the volume... more
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10/28/23

chemistry solution prepare
HOW TO PREPARE:200 ml 0.5 M CH3COONa (you have solid CH3COONa.3H20) (M CH3COONa: 82.03 g/mol)
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10/28/23

ICE tables Chemistry

Determine concentration of hydroxide ion, OH ^- , in a solution of HNO2 by constructing an ICE table, writing the equilibrium constant expression, and using this information to determine the... more
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10/28/23

chemistry calculate pH

Calculate the pH when 90.0 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10⁻⁴)
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10/28/23

what is the volume of the solution in milliliters? 
If 3.90g of CuNO3 is dissolved in water to make a 0.840 M solution, what is the volume of the solution in milliliters? Volume: ? mL
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10/27/23

Write the formation constant expression for the equilibrium between the hydrated metal ion and the aqueous complex.
In aqueous solution the Pb2+ ion forms a complex with four chloride anions.Write the formation constant expression for the equilibrium between the hydrated metal ion and the aqueous complex.Kf = ____
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10/27/23

Calculate the equilibrium molarity of aqueous Pb2+
For the aqueous [PbCI4]2- complex Kf =2.5 x 1015 at 25 °C.Suppose equal volumes of 0.0074M Pb(NO3)2 solution and 0.36M KCI solution are mixed. Calculate the equilibrium molarity of aqueous... more
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10/26/23

In a 0.870 M aqueous solution of a monoprotic acid, 3.51% of the acid is ionized. What is the value of its Ka?
In a 0.870 M  aqueous solution of a monoprotic acid, 3.51% of the acid is ionized. What is the value of its Ka?
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10/26/23

Calculate the pH of a 2.25×10-4 M solution of codeine if the pKa of the conjugate acid is 8.21.
Codeine is a popular prescription pain killer because it is much less addictive than morphine. Codeine contains a basic nitrogen atom that can be protonated to give the conjugate acid of codeine.... more
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10/26/23

Answer for a question below
What volume in milliliters of CO gas would be produced by the complete reaction of 2.40 g of C solid at STP according to the following reaction? Remember 1 mol of an ideal gas has a volume of 22.4... more
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10/26/23

If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.89, determine the [HCHO2] if the [NaCHO2] is 0.735 M.

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10/26/23

chemistry calculation basic
how many moles and how many molecules of lipids is included in one bacteria cell which mass is 2.10-11 gram? We assume that such a cell contains 2% of lipids and that the average molar mass of... more
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10/26/23

Calorimeter question for chemistry

A hot lump of 30.5 g of aluminum at an initial temperature of 69.2 degrees C is placed in a 50.0 mL H_2O initially at 25.0 degrees C and allowed to reach thermal equilibrium. What is the final... more
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10/26/23

What volume in mL of 0.3000 M NaCl solution is required to produce 0.1750 moles of NaCl?
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10/26/23

What quantity in moles of NaOH need to be added to 200.0 mL of a 0.200 M solution of HF to make a buffer with a pH of 2.90? (Ka for HF is 6.8 × 10⁻⁴)
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