294 Answered Questions for the topic Chemistry Lab

Chemistry Lab

12/05/15

Basic Solution Dilution

You need 520. mL of a 15 % (m/v) glucose solution. If you have a 25% (m/v) glucose solution on hand, how many milliliters do you need?

11/28/15

Reasons which explain why the efficiency of a reaction increases as the average rate decreases?

Reasons which explain why the efficiency of a reaction increases as the average rate decreases? in other words, why does a slow chemical reaction is more effective than quick ones? I done an... more
Chemistry Lab

11/07/15

explain why the addition of S2- ion to Cr(OH)3(s) does not result in the formation of Cr2S3(s)

 The addition of S2- ion in to Fe(OH)2(s) results in the formation of FeS(s) 
Chemistry Lab Chemistry

11/05/15

When using crotonic acid(weak acid) and NaOH titration, what is the net ionic equation when you add them both together?

we need the net ionic equations and the ionic equations but I am unsure because I know it does not dissociate completely.
Chemistry Lab

10/21/15

why does our Cucl2 solution become cloudy when NaNO3 is added to it

we added 1.5 g of Nano3 to 4 ml of a 0.5M Cucl2 solution. why did it turn cloudy. does it have something to do with the common ion effect

10/20/15

Is citric acid plus baking soda an endothermic reaction?

Please explain if it is endothermic or exothermic?
Chemistry Lab Chemistry Chem

10/12/15

How to write the balanced equation?

If 3.30g of Cu(NO3)2 is obtained from allowing 1.86g of Cu to react with excess HNO3, what is the percent yield of the reaction? Write the balanced equation.
Chemistry Lab

09/23/15

Calculate the number of moles of H2O removed and the moles of anhydrous CuCl2 remaining in the crucible?

Having trouble with a chem problem, thank you for the help!
Chemistry Lab Chemistry

09/21/15

Find the number of waters of hydration in Epsom salts

Epsom salt os a hydrated ionic compound with the following formula: MgSO4•xH2O. A 4.93 g sample of Epsom salts was heated to drive off the water of hydration. The mass of the sample after complete... more

09/20/15

Crystallization Question needed ASAP please!

You dissolve an amount of solid Q in 195.0 mL solvent, forming an unsaturated solution. The solubility of Q at 0°C is 0.87 g/100 mL. The amount of solid remaining in solution at 0°C is 13.0% of the... more
Chemistry Lab

08/31/15

Calculate the volume of a 0.175 M HBr solution required to neutralize 40.95 mL of 0.300 M Ba(OH)2 solution

Calculate the volume of a 0.175 M HBr solution required to neutralize 40.95 mL of 0.300 M Ba(OH)2 solution

Chemistry Question 3 Need Help ASAP

A laboratory experiment requires 2.0 L of a 1.5 M solution of hydrochloric acid (HCl), but the only available HCl is a 12.0 M stock solution. How could you prepare the solution needed for the lab... more
Chemistry Lab

07/18/15

Redox Titration Lab Question

The reactions given are: I2 + 2Na2S2O3 --> 2NaI + Na2S4O6 ( I2 + 2e^- --> 2I- ) ( 2S2O3^-2 --> S4O6^-2 + 2e^- ) Assume that a 2.130 g sample of bleach was weighed out. When a sodium... more
Chemistry Lab

06/19/15

Chem Lab Oxidation of Manganese

a student conducts an experiment in which mn2+ reacts with another substance and is converted to mno42-. is mn2+ the oxidizing agent or the reducing agent, and how manyelectrons does it gain or... more

06/08/15

If 5 g of sodium bicarbonate is combined with water to make a 100 ml solution, how do I find out how many grams in the final solution?

In chem lab we did a quality control test to determine if the label for sodium bicarbonate (baking soda) is accurate. The label says there is 1,258.56 mg of sodium in a 5 g serving. We made a... more
Chemistry Lab Chemistry Titration

06/07/15

How would I perform a titration for quality control analysis on sodium levels in a soda and vit. C levels in coconut water?

In chemistry lab we are supposed to perform quality control analysis on a basic product and an acidic product. I chose Sprite and coconut water, but I'm trying to figure out how to do the... more
Chemistry Lab

06/06/15

What mass (in grams) of potassium acetate, KC2H3O2, must be added to 124 mL of 0.010 M acetic acid to form a buffer solution with a pH of 4.5?

 I cannot figure out what formula or how to start out the problem. Please help.
Chemistry Lab Chemistry

05/31/15

if i have a 2.0 concentration of an acetic acid in a 100 ml flask at a 3.04 ph what is the Ka expression

I need to find the Ka expression, the volumeof a 2 M acetic acid, the (H+)eq, the (C2H3O2_)eq, and the (HC2H3O2)eq.

05/07/15

what was the final temperature?

A 10.35g piece of copper metal was heated to 85.5 degrees C and then placed into 23.6g of water. the initial temperate of the water was 18.3 degrees C. what was the final temperature?   solid... more
Chemistry Lab Chemistry Moles Volume

04/25/15

Finding concentration!

Please help if you're able. I really don't understand this at all.    A student has a flask containing nitric acid (HNO3 (aq)). She is not sure what the concentration of this acidic solution is... more
Chemistry Lab

04/02/15

What is the ppm Fe in the diluted standard solution?

A diluted iron standard is prepared by pipeting 2.00 mL of stock 40.0 ppm Fe solution into a 50.0 mL volumetric flask, adding the reagents, and diluting to the mark with water.
Chemistry Lab

04/01/15

Chemistry Lab Help Please!

Use a thermometer to measure the temperature of boiling water. Now add salt to the boiling water. Wait until the water boils again then record your new temperature. What happened to the boiling... more
Chemistry Lab Chemistry Elements

03/26/15

Using Clues to Identify Elements

Elements 2, 5, 18, 29, and 33 are colorless, odorless, unreactive gases. Of these gases, element 29 has the largest atomic mass.Elements 13, 19, 23, and 34 have six valence electrons, and element... more
Chemistry Lab Chemistry

03/25/15

chemistry dilution question

how do i calculate the concentration of silver in PPM in a 0.5M solution of AgNO3 in 5% HNO3 solution. The answer should be in PPM
Chemistry Lab

03/11/15

what happens to ionization energy within a family (group 1 to 17) as the atomoc number increases?

How does this effect the properties of the elements within the family?       From Graphing Perdiodic Relationships Lab.  Chemistry Form: L3.3a

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