Hello, If you can please tell me how to find these answers.

find the pH of a solution containing 6 g HCl in 0.25 L of solution

find the ph of 0.15 M Ba(OH)2

find the pH of 0.5 L of HCl solution with a pH of 1.72 to a final volume of 1L

find the pH of 35. mL of 0.5 M HClO4 and 45mL of 0.600 M KOH

2. find amount of acid or base needed to prepare each solution

how many mL of M HNO3 is needed to prepare 1.0 L of 0.25 M HNO3

How many grams of HF to prepare 500 mL of 0.1M HF solution

How many grams of NaOH to prepare 200 mL of 2.5 M NaOH

here's the question: why would scientists believe that certain ions play important roles in human brain function and behaivor?

plz plz help me out the reading was saying something about the ions causing bipolar but i dont reall understand...so pls plz help me!

thanx.

Write the ionic and the net ionic equation for the reactions

A) Ba(CH3CO2)2 +Li2CO3 = BaCO3 + 2LiCH3CO2

B) 2NH4Cl + Hg2(NO3)2 = Hg2Cl2 + 2NH4NO3

I'm trying to do my lab homework on line spectrums and plotting graphs, but I'm really confused as to what I should be doing. Is there anyone who actually understands and knows what to do and can help me out with it? I'll be online until midnite at least and someone can email me at silentange13@gmail.com or msn: silentange13@hotmail.com or aim: silentange13.
I'm not 13, its an old screenname, so I actually need some help here with chem and I'd really appreciate if anyone can help me out. Thanks in advance.

-chem101student

Hey,

I have to do a research paper on a gas and I'm at a loss for which one I should pick. Can anybody suggest a weird, uncommon, out-of-the-way compound that's in gaseous form at SATP?

Thanks.

Im trying to find a chemist because im doing a project and I need some direct info from one. Just Their research (what projects theyre currently working on), where they recieved their PhD, where they are currently employed, why they became a chemist, and their most notable experience being a chemist. Haha, I know its alot, but it would be a great help and I would greatly appreciate it.

Anyone that can do this please private msg me or email me at junit_leader@yahoo.com

Greatly appreciate it,

~Johnathan

Hi! Any help would be greatly appreciated!

A spectrophotometric method for the analysis of iron has a linear calibration curve for standards of 0.00, 5.00, 10.00, 15.00, and 20.00 ppm. An iron ore sample with an expected iron content of 40 - 60% w/w is to be analyzed by this method. An approximately, 0.5 g sample is taken, dissolved in HCL, and diluted to 1 L in a volumetric flask with distilled water. A 5.00 mL aliquot is removed with a pipet. To what volume should it be diluted to minimize the uncertainty in the analysis??

Can anyone help me with a couple problems? Or get me started on them?

How many grams of magnesium (Mg) contain the same number of atoms as 20g of neon (Ne)?

In the reaction given below, how many grams of water are consumed if 4.0g of hydrogen gas and 32.0g of oxygen gas are produced?

2 H_2_O ----> 2 H_2_ + O_2_

*The numbers between the _'s represent subscripts.

Hi there!

I was wondering if someone could help me out with this question:

Give the symbol, including mass number and atomic number, for the isotope which has a mass number of 34 and which has 18 neutrons in each nucleus.

I originally thought about finding the atomic number which is 34-18=16. And then thought about Oxygen and O-zone. Can they be distinguished as two different sorts of elements due to them being formed as radicals? Or have I got this question totally wrong? Thanks for your help.

Can someone please help me with this problem?...

How many moles of H3O or OH must you add to 6.5L of HA solution to adjust its pH from 4.82 to 5.22? Assume negligible volume change.