February 27, 2017

Homework Help: chemistry (drbob222)

Posted by Anonymous on Sunday, October 4, 2009 at 3:07am.

[Ni(NH3)m(H2O)p]^2+ + mHCl ->mCl- + pH2O + Ni^2+ + mNH4^+

excess HCl + OH- -> H2O

A .185 g sample of nickel salt was dissolved in 30.00 mL of 0.1013 N HCl. The excess HCl required 6.30 mL of 0.1262 N NaOH to reach the end point. Calculate the weight of the salt that contains one mole of NH3 (that is the equivalent weight of the salt)

moles of ammonium in sample:
weight of salt that contains one mole of NH3: 0.185/(6.30x10^-3)(.1262)

Propose a molecular formula for the salt in 3 that is consistent with this experimental equivalent weight.

I don't know if I did the first problem correctly. I'm not sure how to do the second problem (proposing the molecular formula - the hint the teacher gave us is that the sum of m and p is less than or equal to 6 and also bromine atoms will need to be mentioned). Thanks in advance for the help!

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