# Chemistry

posted by .

What is the molarity of a solution of Mg(OH)2 if the solution contains 1.35 g in exactly 100 mL of solution???

A 15.0 mL solution of H2SO3 is neutralized by 12.0 mL of a standradized 1.00M NaOH solution. What is the concentration of the H2SO3 solution??????

What volume of a 1.25M stock solution of NaCl would be needed to make up 250 mL of a .25M NaCl solution

• Chemistry -

mols Mg(OH)2 = gams/molar mass
Then M = mols/L soln.

H2SO3 + 2NOH => Na2SO3 + 2H2O
mols NaOH = M x L = ?
mols H2SO3 = 1/2 mols H2SO3 (look at the coefficients in the balanced equation.)
M H2SO3 = mols H2SO3/L H2SO3.

Use c1v1 = c2v2
c = concn
v = volume
1.25M*v1 = 0.25*250
Solve for v1

• Chemistry -

mols Mg(OH)2 = grams/molar mass
1.35g/58.32
=.0231

m/L solution

.0231/100ml = .00231

????? is that right?

## Similar Questions

1. ### Chemistry

determine the approximate molarity of a solution of NaOH prepared by diluting 10ml of 6M NaOH to a volume of 400 ml. using the solution in the first part, 24.5ml of NaOH solution was required to neutralize 26.4ml of a .150M HCl solution. …
2. ### chemistry

if the pH of a half-neutralized acid solution is 5.4, how would you find the [H+] of the the solution. There is 1.0 g of L-ascorbic acid which was dissolved in 100 ml of water. That solution was split in two and 50 ml of the solution …
3. ### ap chemistry

please explain titration problems. I'm a total noob at this and am trying to answer some prelab questions. Examples: 1. How many mL of a 0.800 M NaOH solution is needed to just neutralize 40 mL of a 0.600 M HCl solution?
4. ### chemistry

What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O?
5. ### Chemistry

(a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?
6. ### Chemistry

A 15.0mL solution of H2SO3 is neutralized by 12.0mL of a standardized 1.00M NaOH solution. What is the concentration of the H2SO3 solution?
7. ### chemistry help asap

Please check these thanks. 1. In a titration, 33.21 mL 0.3020M rubidium hydroxide solution is required to exactly neutralize 20.00 mL hydrofluroic acid solution. What is the molarity of the hydrofluroic acid solution?
8. ### chemistry

A student prepares a solution of hydrochloric acid that is approximately 0.1 M and wanted to determine its precise concentration. A 25.00 mL portion of the HCl solution is transferred to a flask, and after a few drops of indicator …
9. ### Chemistry

4 Questions on molarity that I really don't understand. I have the formulas, but they don't seem to fit in to the question right. Please take a look, thanks! 1. Calculate the weight, in grams, of HNO3 present in 1.0 litre of 0.10M …
10. ### Chemistry

The volume of 10 ml of H2SO4 solution was diluted 250 ml with distilled water. This resulting solution, 25 ml were neutralized by 10 ml of 0.1 mol/L solution of NaOH. calculate the Molarity of sulfuric acid.

More Similar Questions