Homework Help - November 2007

What! I have no clue with this problem. My teacher didn't explain this well at all! Any help appreciated! Please show steps so maybe I can get what I'm missing!

A 3.381-g sample of a solid, weak, monoprotic acid is used to make 100.0 mL of solution. 25.0 mL of this solution was titrated with 0.08316-M NaOH. The pH after the addition of 20.89 mL of base was 7.31, and the equivalence point was reached with the addition of 46.01 mL of base.
a) How many millimoles of acid are in the original solid sample? Hint: Don't forget the dilution.


b) What is the molar mass of the acid?

c) What is the pKa of the acid?

2007-11-06 14:50:07 · 2 answers · asked by crazygirl0630 2

2(x)^4 + 3(x)^2 - 7(x) + 3 = 0

how 2 solve this polynomials' roots? I've spent 4 hours and can't get it.

Thanks,
N

2007-11-06 14:18:56 · 1 answers · asked by Corpral Clegg 2

A bank contains $2.80 in nickels and quarters . there r 20 coins in all . how many of each kind are there ?


plz explane to me how to solve it . thank you very much .

2007-11-06 14:14:35 · 5 answers · asked by tt88754 1

Do I underline it, italicize it, put it in quotation marks or whatever? Thanks =]

2007-11-06 13:48:22 · 2 answers · asked by Me 7

if n=nickels
d=dimes


The number of nickels is 7 less then the number of dimes .

2007-11-06 13:48:07 · 16 answers · asked by Anonymous

the word grave (adjective) meaning important and requiring serious thought
and the word suffice (verb) meaning to be enough or sufficent
I can't think of a sentence using grave but for suffice would
Water and fruits are the two things to suffice my life. ??
thankss for ur help

2007-11-06 13:47:13 · 2 answers · asked by BeProud 3

english HW

2007-11-06 12:26:21 · 14 answers · asked by Poetic1 1

I have to do a project for this!

2007-11-06 12:13:31 · 3 answers · asked by Anonymous

Performing a titration without an indicator is like __________ ?

2007-11-06 12:11:45 · 3 answers · asked by : ) ♥ 2

Name the European people who introduced a plantation system of agriculture in what is now known as Indonesia

2007-11-06 12:06:53 · 2 answers · asked by Anonymous

i need to know this for part of my social studies speach because the the guy said that we need to answer any questions that we can think that someone would ask. i'm thinkning i could say that like the world is becoming more bilingual and a lot of people from other countries that speak different languages are moving into france. what do you think?

2007-11-06 11:43:26 · 16 answers · asked by kaylarose 2

Do you capitalize igneous, sedimentary, and metamorphic rocks. Like to u capitalize the i in igneous? I am writing a paper and im not sure if i capitalize it, Thanx!

2007-11-06 11:40:08 · 4 answers · asked by mi nombre 4

THE PROBLEM IS : You push a 2-kg book with a force of 5 N. Find the force of sliding friction on the book if it has an acceleration of 1.0 m/s2.

2007-11-06 11:28:16 · 1 answers · asked by abiprz 1

I really need help with unit analysis in my algebra 1 class. Can someone help me I would really appreciate it! =)

We are working in the Prentice Hall Algebra 1 book. Chapter 4 lesson 1.

2007-11-06 11:09:00 · 1 answers · asked by Anonymous

Find the inflection point(s), if any, of the function:

f(x) = 3x e^x.

Show that the function f(x) = x^3 + x - 1 is increasing for all x.

Thanks for the help in advance!!!!

2007-11-06 10:48:04 · 2 answers · asked by KERRY K 1

I'm talking about Thomas Jefferson...

2007-11-06 10:45:30 · 3 answers · asked by Juan C 6

2007-11-06 10:44:32 · 2 answers · asked by julesoo1000 2

Thanks for any help! Greatly Appreciated.

2007-11-06 10:44:29 · 1 answers · asked by KERRY K 1

I'm writing a debate speech paper on why I am FOR CAPITAL PUNISHMENT. Anyone have some good solid reasons I can use? I have some information and such but I need some reasons to plant them on. Please don't try to sway me one way or another. I already have my side, and am happy where I am. THANKS!

2007-11-06 10:27:45 · 6 answers · asked by Bello Stella 4

2007-11-06 10:24:49 · 1 answers · asked by mandy50203 1

Given the x-values, solve for y. Then graph the equation and label the line.


1) y= 2x + 1

x= -1 ____
x= 1 ____

2007-11-06 10:20:31 · 1 answers · asked by erikjjjacob 1

Arielle has a collection of grasshoppers and crickets. She has 561 insects in all. The number of grasshoppers is twice the number of crickets. Find the number of each type of insect that she has.

2007-11-06 10:12:12 · 25 answers · asked by ohmygoditsanne 1

2007-11-06 10:00:38 · 4 answers · asked by Anonymous

For my science hw i have to balance equations. Here are some of the problems:

CH4 + O2 --> CO2 + H2O

Na + I2 --> NaI

N2 + O3 --> N2O

I have 12 other problems but I'm hoping i can figure them out after these. Can you explain to me in A LOT of detail how to balance them. I looked at so many websites and I'm even more confused now. Please help and dont just copy and paste something, explain it yourself. Also, I'm in 7th Grade Double XX but when you explain it pretend I'm like 10 years old. Thanks in advance.
<3bindorski

2007-11-06 09:52:44 · 3 answers · asked by Anonymous

I just wanna make sure I'm right!

1. If T=f(H) is time in minutes to bake a ckae @ H degrees F, what is the meaning and units of the inverse function?

2. A population is given in the formula P=f(t)=20+0.4t where P is the # of people (thousands) and t is the number of years since 1970. Evaluate the following quantities!

a. Evaluate f(25) and explain in word what it tells u about the population.

b. Determine f^-1

c. Evaluate f^-1(25) and explain in word what it tells u about the population.

3. Determine the inverse of f(x)=3x+1/x-2


LASTLY...

Give a prectical interpretation of the function:
f(h(t)), where A=f(r) is the area of a circle of radius r and r=h(t) is the radius of the circle at time t.

Please answer as many as possible.

THANKS

2007-11-06 09:46:56 · 3 answers · asked by Allana S 1

i cant find it in my textbook because we learned about them on a worksheet..... and i cant find it on google.

2007-11-06 09:32:14 · 1 answers · asked by Anonymous

please i need help finding a goood science fair topic
i would like to do something with engineering! :]

2007-11-06 08:54:23 · 4 answers · asked by Sara b. 2

we need to plan a perfect crime for law class. we need motives for murder. but the thing is, we can't have it link back to us...thus making it the 'perfect crime'. it can't be too complicated b/c we have to explain it to the class and also make a movie on it.
help please

2007-11-06 08:19:59 · 1 answers · asked by taylor 1

2007-11-06 05:53:26 · 1 answers · asked by fastwork 1

Can someone please find me a site about the effects of changes to the Amazon have had on the tribes which live in the Amazon Rainforest.
Also how the tribes have changed and adjusted with modern day.
Basically all about how the Amazon's tribes have changed.
Please help!!! Thank you!!!!

2007-11-06 05:19:02 · 1 answers · asked by Anonymous