Chem People
<div class="IPBDescription">HELP! ASAP!</div> I'm having a problem with these two reactions.
NaCl + H2O →
MgCl2 + H2O →
I keep getting HCl for both as the answer, but both of my chem books states that for the first reaction, I'm supposed to get a neutral solution. For the second I'm supposed to get a weak acid, and HCl is NOT weak.
NaCl + H2O →
MgCl2 + H2O →
I keep getting HCl for both as the answer, but both of my chem books states that for the first reaction, I'm supposed to get a neutral solution. For the second I'm supposed to get a weak acid, and HCl is NOT weak.
Comments
MgCl2 + H2O -> (2)HCl + MgO (HCl when mixed with MgO considered a weak acidic solution not neutral)
<--- Large chem nerd
*edited for correct chemical formula*
HCl + NaOH -> ?
so it'd be HOH (Hydrogen hydroxide = water <!--emo&:p--><img src='http://www.unknownworlds.com/forums/html//emoticons/tounge.gif' border='0' style='vertical-align:middle' alt='tounge.gif' /><!--endemo--> ) and NaCl (yay salt).
HCl + NaOH -> HOH + NaCl
(whenever you combine and acid and a base you'll get water and a salt)
[I know WoT did this, but I want to do it anyway <!--emo&:p--><img src='http://www.unknownworlds.com/forums/html//emoticons/tounge.gif' border='0' style='vertical-align:middle' alt='tounge.gif' /><!--endemo--> ]
MgCl2 + 2HOH -> ?
Cl = -1, OH = -1
MgOH2 + 2HCl
so, MgCl2 + 2HOH -> MgOH2 + 2HCl
(OH (-1) is a special combination of elements (forget what they're called...like Carbonate, Nitrate...and others). OH is hydroxide, and generally it's easier to read if you don't seperate the O and H...as in H2O...because that's not how the element actually looks.
[edit] what I want to know is why hydroxide is written OH, despite the fact it's HydrOxide... bah [edit]
Salt and water.
I mean really you don't need to be a genius to figure out that salt water isn't a strong acid <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html//emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif' /><!--endemo-->
On a technicality, nothing really happens other than creation of aqueous NaCl, which won't do anything else. You'd need to use electrolysis to produce something meaningful. So if nothing else is being done, all you'll get is saltwater because Na is too clingy to its Cl
MgCl2 + H2O →
Magnesium is more reactive than sodium, and forms an aqueous salt and a little bit of HCl. This is way different to NaCl which'll form no acid at all. While HCl is a strong acid, when you have very little of it floating in a solution outnumbered by an aqueous salt you won't notice its effect at all. Mg has a looser grip on its Cl and some will escape, but not an awful lot unless you begin tinkering with it.
Its a tricky question to illustrate the difference in reactivity between Group 1 and Group 2 metals. You may or may not have to point this out in your answer.
Edit - just wanted to clear it up a bit.
<!--QuoteBegin--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td><b>QUOTE</b> </td></tr><tr><td id='QUOTE'><!--QuoteEBegin-->Hydrogen hydroxide <!--QuoteEnd--></td></tr></table><div class='postcolor'><!--QuoteEEnd-->
A green politian in New Zealand wanted to ban Dihydrogen Monoxide <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html//emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif' /><!--endemo--> Funniest thing ever.
<!--QuoteBegin--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td><b>QUOTE</b> </td></tr><tr><td id='QUOTE'><!--QuoteEBegin-->Hydrogen hydroxide <!--QuoteEnd--></td></tr></table><div class='postcolor'><!--QuoteEEnd-->
A green politian in New Zealand wanted to ban Dihydrogen Monoxide <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html//emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif' /><!--endemo--> Funniest thing ever. <!--QuoteEnd--> </td></tr></table><div class='postcolor'> <!--QuoteEEnd-->
I thought that was just a joke? Something bored teenagers get people to sign petitions for...
Cuz it's a hydroxyl group, and the end on the left is what attaches to the rest of the molecule.
Salt and water.
I mean really you don't need to be a genius to figure out that salt water isn't a strong acid <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html//emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif' /><!--endemo-->
On a technicality, nothing really happens other than creation of aqueous NaCl, which won't do anything else. You'd need to use electrolysis to produce something meaningful. So if nothing else is being done, all you'll get is saltwater because Na is too clingy to its Cl <!--QuoteEnd--></td></tr></table><div class='postcolor'><!--QuoteEEnd-->
You know, he is right here, the Na- and Cl+ will dissolve in the water...they wont actually seperate and form hydrochloric acid and sodium hydroxide - they just from ions which will return to NaCl if the water is taken away.
Which is why I stated above, our teacher always asked us what happend if HCl and NaOH were combined...unless you're in an advanced chemistry class, your tearcher probably wants the new chemicals and not the ions dissolving in water.
...then again, you could just check your chemistry notes and chemistry book.
[edit] wrong charges on my ions <!--emo&:p--><img src='http://www.unknownworlds.com/forums/html//emoticons/tounge.gif' border='0' style='vertical-align:middle' alt='tounge.gif' /><!--endemo--> [edit]
Thus:
Na-O-H
H-O-H
CH3CH2-O-H
I don't like chemistry homeworks because you have to be very specific about the level of teaching involved.
Ditto mathematics - remember in school they'd say "which of these numbers is divisible by three"........ well they ALL ARE. Fools.
Negative square roots are another level dependant maths thing.
<span style='font-size:2pt;line-height:100%'>Its generally i for the mathematicians but can be j in engineering</span>
IE "which of these numbers is WHOLLY DIVISIBLE by three"