7.) You need to make an aqueous solution of 0.140 M nickel(II) sulfate for an experiment in lab, using a 250 mL volumetric flask. How much solid nickel(II) sulfate should you add?

How many milliliters of an aqueous solution of 0.175 M sodium hydroxide is needed to obtain 5.85 grams of the salt?

8.)

In the laboratory you dissolve 14.0 g of nickel(II) sulfate in a volumetric flask and add water to a total volume of 250 mL.

What is the molarity of the solution?
What is the concentration of the nickel cation?

What is the concentration of the sulfate anion?

b.) In the laboratory you dissolve 17.5 g of sodium hydroxide in a volumetric flask and add water to a total volume of 125 mL.

What is the molarity of the solution?

What is the concentration of the sodium cation?

What is the concentration of the hydroxide anion?

Calculate the change in pH when 75.0 mL of a 0.620 M solution of NaOH is added to 1.00 L of a solution that is 1.00 M in sodium acetate and 1.00 M in acetic acid.

Polarimetry Lab calculations:

I would like some help to figure out how to do this; I want to make sure that I am doing it correct. Here is what I have done so far:

1. Find specific rotations for all the isomers:

I believe these are the equations to use:

X _observed= X _raw - Blank             l= 0.8 dm and c= 0.9600 g/cm³

[X]= X _observed / lc

Can someone show me the calculations for all of them, this is what I did for Unknown:

My Unknown (X): I did x observed= 175.25-200.75= -25.5°

[X]= X _observed / lc -25.5°/(0.8*0.9600)= -33.20°

2. Find the Enantiomer Excess:

The equations our teacher gave were:

EE= [X] _observed / [X]_pure * 100

([X]_pure can be found by [X]= X_pure/ lc

I don’t know how to find x pure. What even is that, where can I get it from the numbers. After I get EE,

I need to find how much of (-) and (+) is in the enantiomer (the equation given for that is

EE= [X]₊ XA + [X]_- (1-X₊)

[X]₊ and [X]_- are supposed to be answers from number 1.

Please compare and contrast intrinsic versus extrinsic fluorophores. Please be sure to clearly address differences in terms of quantum yield, fluorescence lifetimes, cost, etc.

The dehydration of 2-methyl-2-butanol in sulfuric acid produces 2 elimination products. However, this same reaction can also undergo substitution. What is the product of the substitution reaction?

Consider the titration of 0.050 M HCl with 0.050 M NaOH. Calculate the pH: (a) of the pure HCl solution; (b) of 25.00 mL acid plus 12.50 mL base; (c) at the quivalence point; and (d) of 25.00 mL acid and 37.50 mL base.

Please answer within 1 hour. This is my last question and its due in 1 hour!! :(

What atomic or hybrid orbitals make up the sigma bond between C2 and Cl in dichloroethylene, CH2CCl2? (C2 is the second carbon in the structure as written.) ________ orbital on C2+_________orbital on Cl What is the approximate C1-C2-Cl bond angle?________

Write the net equation for hydrolysis (with states and charges) of the following:

A) NaC2H3O2

B) NH4Cl

C) ZnCl2

D) KAl(SO4)2

(1a) Explain what happens in Oxidation AND Reduction electrochemical reactions.

(1b) What happens to the ions formed in the oxidation reaction?

Give a brief definition of the following terms (a

Titanium metal has a melting point of 1660°C. Use the information below as needed to estimate the boiling point of titanium. HINT: Try writing the boiling process as a simple chemical reaction, and then think about when that reaction would be spontaneous.  

Electromagnetic radiation is emitted when a neutron and proton fuse to make a deuteron. What is the wavelength of this radiation?

The reaction below was performed with 0.342 grams of K2CO3 (molar mass = 138.21 g/mol). After the reaction was complete 0.0675 grams of CO2 was recovered. What was the percent yield to 2 significant figures?

K2CO3(s) --> K2O(s) + CO2(g)

The correct answer is 62 %, but I don't understand how they got there. Please help explain the steps

Answer the following:

1: a) . Breathalyzers determine the alcohol content in a person’s breath by a redox reaction using dichromate ions (the unbalanced reaction is shown below). C2H5OH + Cr2O7 2− → CH3CO2H + Cr3+ a. Determine the number of electrons transferred in this redox reaction. b. Determine the concentration (in M) of Cr3+ in 50.0mL of solution at half the Canadian legal blood alcohol concentration limit (BAC, limit is 0.08 mg/mL).

b) The Keq for the reaction between strontium metal and titanium ions (shown below) is 4.0x1042. Calculate Eo for a strontium-titanium battery. Sr(s) + Ti2+(aq) ⇌ Sr2+(aq) + Ti(s)

How to Write a chemistry Lab report?

I have to write a chemistry lab report, also to presnte it.

The paper should incloud:

- Abstract

- Introduction

- Methods

- Results

- Discussion

- Conclusion

- Confined research

- Citation

Can I have help to describe for me what to write in general in each section of the worlds above (i mean what should write about: is it the equation and describ it? or just write a general info? or in methods just to write the prosses in points or more? and like this )

My Experment about :

System (1):

Investigate the heat lost or gained when a specific or group pf chemicals are added to water.

Sodium Chloride.

I need help to know what to write in the 7 section which the abstract and introducion and all other?