305 Answered Questions for the topic Chemistry Lab

Chemistry Lab Chemistry Moles Stoichiometry


A certain mass of an unknown third period metal hydroxide reacts with an certain volume and concentration of a diprotic acid. How do I figure out the identity of the metal?

I used dimensional analysis and the molarity of the acid to find the moles of the acid, then multiplied it by the 1:2 stoichiometric ratio since it's a diprotic acid. This gave me the moles of the... more
Chemistry Lab Chemistry


If 36.10 mL of 0.223 M NaOH is used to neutralize a 0.515 g sample of citric acid, what is the molar mass of the acid

Help with Chem lab 7 quantative analysis of vinegar via titration
Chemistry Lab Science Chemistry Moles


4NH3 + 5O2 = 4NO + 6H2O How many grams of O2 are needed to completely react with 3.315 moles of NH3?

Grateful for any help given!
Chemistry Lab Science Chemistry Moles


4NH3 + 5O2 = 4NO + 6H2O If you made with 9.67 moles of H20, how many moles of NO were also produced?

Already balanced equation I keep getting this one wrong and I'm not sure if it's my setup or if I'm dividing something wrong. Grateful for any help given!
Chemistry Lab Science Chemistry Moles


Mass of CaCl2: 10,0 g Mass of Na2CO3: 10.0 g Actual amount collected: 2.00 g CaCO3 1. Write a balanced chemical equation.

A student performs a lab at school. They massed out both reactants and then mixed them together. The reaction produced a precipitate. They filtered out the product and took the mass of it. (I'm a... more
Chemistry Lab Science Chemistry Moles


H2SO4 + 2 NaOH = Na2SO4 + 2 H2O How many grams of Na2SO4 could be produced from 4.94 moles of sulfuric acid?

Grateful for any help given!


its urgent help with chemistry plz

Consider the equation      2 C2H6 +  7 O2 --->  4 CO2 +  6H2OHow many grams of H2O are produced from 268.5 grams of C2H6 ?


Calculate the densities of both the water and the isopropyl alcohol and the percent error...

The accepted value for the density of water is 1.00 g/mL and the accepted density for isopropyl alcohol is 0.786 g/mL.percent error = experimental density minus accepted density divided by accepted... more
Chemistry Lab Chemistry Volume Mass


Calculate the density of the magnet and bolt...

Magnet:Mass (g) = 7.93 gInitial volume of graduated cylinder = 7.00 mLFinal volume of graduated cylinder = 9.00 mLObject volume = 2.00 mLDensity (g/mL) ?Bolt:Mass (g) = 6.61 gInitial volume of... more
Chemistry Lab


A  72.7 mL sample of oxygen was collected over water.  The atmospheric pressure is 0.861 atm and the temperature of the water is 19.0 °C.  What are the moles of oxygen?

A  72.7 mL sample of oxygen was collected over water.  The atmospheric pressure is 0.861 atm and the temperature of the water is 19.0 °C.  What are the moles of oxygen?


Finding the difference in solubility

Consider the solubility of Ca(OH)2 in each of the following solutions. For each solution, indicate whether the Ca(OH)2 solubility will increase, decrease, or not change as compared to the... more
Chemistry Lab Chemistry Lab Chem Lab


Finding the Ksp value of Ca(OH)2

A student determined the solubility of Ca(OH)2 in 0.200 M CaCl2 as 0.0026 mol/L. Calculate the Ksp value for Ca(OH)2 using these data. I found this to be =7.03E-8, but it says that I have entered... more


General Chemistry Lab Question 4.16.20

In lab you are asked to perform an experiment that requires 100.00 mL of a 0.350 M potassium chloride solution. All you have in the lab though is a 0.750 M potassium chloride solution. Explain (in... more


Calorimetry: How to Find Heat Lost?

In Part 1 of the lab you will test how well a coffee cup calorimeter matches the ideal case. You will do this by adding a known mass of warmer than room temperature water (at a known temperature)... more

very confusing chem question

he following reaction illustrates the decomposition of hydrogen peroxide (H2O2) to form water and oxygen gas:2 H2O2 (l) → 2 H2O (l) + O2 (g)When this reaction is carried out, 0.50 L of O2 gas is... more
Chemistry Lab Chemistry


Need help with solving this chemistry question

1a. Write a balanced equation and corresponding Ka expression for the ionization of the weak acid lactic acid(HC3H5O3, Ka=1.62x10^-4) in water b. A buffer solution is prepared by dissolving... more
Chemistry Lab


Need help with this chemistry question

a. Find the volume of 1.0M tartaric acid, H2C4H4O6, solution that when diluted to a total volume of 250.0ml produces a solution that is 0.050M in tartaric acid.b. Find the mass of potassium... more

Chemistry homework help

Write a balanced metathesis equation for the reaction which takes place when the two solutions described below are combined and then determine the amount of solid product produced. 250.0 ml of... more
Chemistry Lab Chemistry


Titrating NaOH and acetic acid in vinegar

If the vinegar used in the lab had 5.89 g of acetic acid per 100. mL of vinegar, what volume (in mL) of 0.0998 M NaOH would you use to reach the endpoint of the titration?
Chemistry Lab Chemistry


Percent Yield of Alum Lab

I've recently did a lab to turn aluminum foil into alum using KOH and Sulfuric Acid.I need to find the percent yield of alum, but don't how to figure out which information I need.Here is what I... more
Chemistry Lab


How many molecules are in 2 moles of molecules?

 How do you even do this question?

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