February 21, 2017

Homework Help: Chem. Could someone check my answer.

Posted by Tiffany on Wednesday, December 3, 2008 at 1:16am.

(1) To make NaTcO4, Tc metal is dissolved in nitric acid to make HTcO4, NO2 and H2O. Then the product HTcO4 is treated with NaOH to make NaTcO4. If you begin with 4.5 mg of Tc metal, how much of NaOH (in grams) is required to convert all of the HTcO4 into NaTcO4?

Tc + 7HNO3 = HTcO4 + 7NO2 + 3H2O

HTcO4 + NaOH = NaTcO4 + H2O

I used these to find the answer.... 0018 g NaOH.

(2)Explain how to prepare zinc chloride by a) acid-base reaction or b) a gas formation reaction. The starting materials available are ZnCO3, HCL, CL2, HNO3, NaCL, Zn(NO3)2, and Zn.

(a) ZnCO3(aq) + 2HCl(aq) ---> ZnCl2(aq) + H2O(l) + CO2(g); ZnCO3 is a base, HCl is an acid.

(b)Zn + HCl --> ZnCl2 + H2; H2 is a gas.

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