Wednesday
April 16, 2014

Homework Help: Chemistry

Posted by Alex on Friday, September 3, 2010 at 10:21pm.

A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.96 gallons of water. You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution?
Answer in units of M.

What volume of ethanol must be diluted with water to prepare 402 mL of 0.868 M solution? The density of ethanol is given as 0.789 g/mL
Answer in units of mL.

What weight of sodium nitrate (NaNO3) must be used to prepare 560mL of a 10.8Msolution of this salt in water?
Answer in units of g.

We dissolve 95 grams of sodium sulfate (Na2SO4) in 8 grams of water. What is the percent by mass of sodium sulfate in this solution?
Answer in units of %.

What volume of 0.558MK3PO4 is required to react with 47 mL of 0.343 M MgCl2 according to the equation 2K3PO4 + 3MgCl2 = Mg3(PO4)2 + 6KCl
Answer in units of mL.

We find that it takes 70.3 mL of NaOH to neutralize (react exactly with) 155 mL of a 0.300 molar HNO3 solution according to the reaction NaOH + HNO3 = NaNO3 + H2O.
What is the molarity of the NaOH solution?
Answer in units of M.

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