# Chemistry

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

1. 👍 0
2. 👎 0
3. 👁 522
1. 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

1. 👍 0
2. 👎 0
2. mols Mg(OH)2 = grams/molar mass
1.35g/58.32
=.0231

m/L solution

.0231/100ml = .00231

????? is that right?

1. 👍 0
2. 👎 0

## Similar Questions

1. ### 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? (c) How many milliliters of 6.00 MNaOH

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.945 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 33.9 mL of barium hydroxide to reach the endpoint. A.

3. ### chemistry

calculate the molarity of each of the following solutions. Help!! (a) 0.36 mol of LiNO3 L of solution (b) 70.7 g C2H6O in 2.25 L of solution (c) 11.56 mg KI in 114.2 mL of solution

4. ### chemistry

What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous

1. ### chemistry

Finding molarity and molality(best answer)? An aqueous solution is prepared by diluting 3.30 mL acetone,(d= 0.789g/mL) with water to a final volume of 75.0 mL. The density of the solution is 0.993 g/mL. What is the molarity,

2. ### chemistry

Find the molar masses of the following compounds: 1. LiI 2. PbCO4 3. Mg(OH)2 4. (NH4)3PO4 Find the percent composition (percent by mass) of the given element in the following compounds: 1. Fluorine in AgF 2. Hydrogen in glucose

3. ### Chemistry

A solution is created by dissolving 13.0 grams of ammonium chloride in enough water to make 265 mL of solution. How many moles of ammonium chloride are present in the resulting solution? When thinking about the amount of solute

4. ### Chemistry

An aqueous KNO3 solution is made using 72.5 grams of KNO3 diluted to a total solution volume of 2.00 liters. If the molarity of the solution is .359 M and the molality of the solution is .354, what is the mass percent of the

1. ### Chemistry

A sample of solid Ca(OH)2 is stirred in water at 30°C until the solution contains as much dissolved Ca(OH)2 as it can hold. A 100.-mL sample of this solution is withdrawn and titrated with 5.00 X 10^-2 M HBr. It requires 48.8 mL

2. ### Chemistry

What is the molarity of a solution with 3.5mol of CaCl2 in 1.89L of solution What is the molarity of a solution with 16g of CH3OH in 487mL of solution

3. ### chemistry

What is the molarity of a potassium hydroxide solution if 38.65 mL of the KOH solution is required to titrate 25.84 mL of 0.1982 M hydrochloric acid solution?

4. ### Chemistry

I'm having trouble with molarity. What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100.0 mL?