Ericka

This page lists questions and answers that were posted by visitors named Ericka.

Questions

The following questions were asked by visitors named Ericka.

24 mL of 0.39 mol/L acetic acid is titrated with a standardized 0.33 mol/L KOH solution. Calculate the pH of the solution after 17 mL of the KOH solution has been added. Assume the Ka of acetic acid is 1.8 x 10-5.

If the concentration of Pb2+ is found to be 2.3 x 10-9 mol/L in a saturated solution of Pb3(PO4)2, what is the Ksp of Pb3(PO4)2 ?

What is zinc's hardness (high, medium or low) I found the number on a hardness scale, (2) but I have no idea how the scale works, and if this would be considered high.

I have to list all of the ions of zinc, the thing is, the only ion I could find was Zn^2+. I've googled "ions of zinc" but this was the only one I could find. Are there any others? Thanks.

Given: latent heat of fusion of water 3.33x10^5 J/kg. A 147 g cube of ice at 0 degress C is dropped into 1.3 kg of water that was originally at 79 degrees C. What is the final temperature of the water after the ice melts.

A buffer is made by adding 0.300 mol HC2H3O2 and 0.300 mol NaC2H3O2 to enough water to make 1.00 L of solution. The pH of the buffer is 4.74 . Calculate the pH of this solution after 0.020 mol of NaOH is added.

10g of Sodium Chloride are dissolved in 200ml of H2O. What is the mass percentage of solute in this solution?

Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10-2 hr-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

Flying against the wind, an airplane travels in hours. Flying with the wind, the same plane travels in hours. What is the rate of the plane in still air and what is the rate of the wind? Rate of the plane still in the air= ____km/h Rate of the wind= ____k...

What interest rate, compounded monthly, would you need to be paid in order to grow a $2000 investment into $3500 over a five year period?

What interest rate, compounded weekly, would you need to be paid in order to grow an $8000 investment into $12,000 over a ten year period?

How many years will it take for $12,000 to grow to $15,000 at 5.75% compounded monthly?

A two card hand is dealt from a standard deck. What is the probability of drawing at least one face card?

If someone's height is six feet and is enlarged to 16.8 inches, what is the scale factor?

Although most students begin by assuming settled farming life was better than that lived by hunter-gatherers, closer acquaintance with full Paleolithic Hunter-Gatherer life shows us many aspects that could be considered easier than that of very early, set...

"As his power grows, Charlemagne proves himself a mastermind, next to military and civil government." In what ways?

I need help please I am not understanding what my instructor means by "trace the contextof the question across the entire sweep of time, from pre history to c. 1500CE, converting at least 3 separate eras as they are viewed in at least three world culture...

A surveyor measures the distance between buildings X and Y as 200 feet. The angle of elevation from the base of X to the top of Y is 25 degrees. What is the height of building Y?

Two balls are drawn from a bag with 4 black balls and 2 white balls. Find th probability distribution got drawing 2 black balls.

I have to print some pictures about or from the book "Lightning Theif" Does anyone know some pictures? *It cannot be from the movie.

How do I put this into 2 sentences? up:down heavy:light For example: water:liquid ice:solid Water is a type of liquid. Ice is a type of solid.

Write the following fraction as a numeral: One piece of pie from a pie that is cut into six parts. Please check: 1/6

What are some helpful hints or tips about fractions?

What is a motif?

What is the motif in "Lightning Thief" ?

A rectangular brick measures 6cm by 9cm by 20cm and has a mass of 2.563 kilograms. What is the density of the brick in grams per cubic centimeter?

I'm confused regarding the elimination method for 5x - 7y = -16, 2x + 8y = 26

The approximate concentration of a hydrochloric acid solution is 0.5M. The exact concentration of this solution is to be determined by the titration with 0.5M solution of sodium hydroxide. A 10.00 ml of HCl solution was transferred by pipet to an Erlenmey...

A student performed an experiment to determine the molecular weight of a gaseous compound. Using the ideal gas law PV = nRT, and knowing the pressure, temperature, and volume of the vapor, the student calculated the number of moles of gas, n, to be 0.0443...

According to Aristotle , what makes the rich and downtrodden poor rulers?

Which is J = 4rb solved for r? a. r = J/4b ** b. r = 4b/J c. r = J - 4b d. r = J/b

Which pair of states is most likeley to have a similar climate? Oregón arizona? Virginia and North dokota? Ohio and florida? Kansas and missouri?

Answers

The following answers were posted by visitors named Ericka.

Ionization equation for Pb3(PO4)2 is Pb3(PO4)2 --> Pb^2+ + 2PO4^3- Ksp = [Pb^2+][2PO4^3-] Ksp = [2.3 x 10-9 mol][4.6 x 10-9 mol] = 1.1 x 10-16 mol I am stuck

Whats wrong with this answer? Ksp = [Pb2+]^3 [PO4]^2 = (2.3E-9)^3 (2/3 * 2.3E-9)^2 = 4/9 * (2.3E-9)^5

Ok. What is a motif, though?

All these answers were correct when I used them. I got a 100%! Thank you!

I think the answer is 20

Brain has 3 basketball cards And 5 baseball cards . What fraction of brain's cards are baseball cards?

TySm Nashi ty to u tht I got a perfect 100% suckers yep anon ur wrong and Nashi is right feel the pain ugly

TYSM TOYSONIC YOU SAVED MY GRADES!