# chemistry

posted by .

Calculate the mass of solid Na2S2O3•5H2O required to prepare 300. mL of 0.0200 M Na2S2O3

• chemistry -

.3L of .02M solution contains .006 moles of solute.

So, take .006 * mol wt of solute to get the mass

• chemistry -

ok.. that's what I had done before..

Na2s203 has a mass of 158.11g

so I get for 0.006 mol of Na2s203 = 0.9486 g or with 3 significant figures = 9.48 mg.

but this still comes up as wrong when I put it into my online portal for my lab.

• chemistry -

The problem asks for mass Na2S2O3.5H2O. You calculated mass Na2S2O3. Add the 5 mols H2O to find the mass of the hydrated salt.

## Similar Questions

1. ### chemistry,

in analyzing household bleach. I have a flask that contains 10.00 mL diluted bleach + 0.4g KI + 20 mL distilled water and 20 drops of 2M HCl. To that I titrated 30.60 mL Na2S2O3 and I need to calculate the number of moles of NaOCl …
2. ### Chemistry

What is the full net ionic equation for each reaction?
3. ### Chemistry

What is the full net ionic equation for each reaction?
4. ### chemistry

Calculate the mass of the solid you must measure out to prepare 100 mL of 0.025 M CuSO4. Note that this salt is a hydrate, so its formula is CuSO4⋅5H2O. You must include the waters of hydration when calculating the formula weights. …
5. ### Chemistry

Copper(I) Iodide is synthesised by the equation: 2CuSO4.5H2O + 2KI + 2Na2S2O3.5H2O --> 2CuI + K2SO4 + Na2SO4 + Na2S4O6 + 10H2O Would it make a difference if anhydrous CuSO4 and Na2S2O3 are used instead?
6. ### Chemistry*

The following equation is given: S2O3 -2 + 2H +1 ---> S + SO2 + H2O [HCl] = 2 mol/L [Na2S2O3]= 0.3 mol/L what is the concentration (mol/L) of H+ if you were to add: a) 20 mL of HCL with 5 mL Na2S2O3 & with 5 mL H2O b) 15 mL of HCl …
7. ### Chemistry

Can someone please help me complete these calculations for my lab; I am having some trouble. A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ?
8. ### Science- Chemistry

How do I figure these out? A solution of sodium thiosulfate, Na2S2O3, is 0.1365 M. 29.28 mL of this solution reacts with 39.79 mL of I2 solution. What is the molarity of the I2 solution?
9. ### chemistry

Sodium thiosulfate, Na2S2O3, is used as a fixer in photographic film developing. The amount of Na2S2O3 in a solution can be determined by a titration with iodine, I2, according to the equation: 2Na2S2O3(aq) + I2(aq) --> Na2S4O6 …
10. ### Chemistry

Suppose a student diluted and titrated a bleach unknown exactly as described in the experimental procedure, except only a single titration was performed which required 16.22 mL of 0.100 M Na2S2O3. Calculate the number of moles of Na2S2O3 …

More Similar Questions