Group 2 Alkaline Earth Metals Explained

[@_User__name802]

Hello Sir. Why does the solubility of group 2 sulphates decrease down the group?

[@chemistrytutor]

One of the things influencing solubility is the sizes of the ions. When looking at a pattern down a group an important reason is the size comparison. The sulfate is a large ion, and so as the size of group 2 metal ion increases the ions become closer in size. This makes the sulfate less soluble. Its the same but opposite reason for hydroxides. The hydroxide ion is small and so as the gp 2 metal ion gets larger, they become very different in size and so it becomes less soluble

[@_User__name802]

@@chemistrytutorThank you so much Sir

[@chemistrytutor]

@@_User__name802 👍

[@mrqwerty4792]

100% better than allery chemistry idc

[@chemistrytutor]

You're very kind, thank you 😊

[@mrqwerty4792]

@@chemistrytutor np bro your the best teacher that has ever walked the planet and thats no exaggeration

[@chemistrytutor]

@@mrqwerty4792 🤏

[@chemmy8062]

IKR! When I was watching his videos on the same exact topic, I didn't understand a lot of stuff. But this teacher made me understand everything. He's a gem for slow learners like me.

[@Masowe.]

small and precise. now i know that mg is a reducing agent ti4 process

[@chemistrytutor]

😀👍

[@alexanderedits9917]

Thank you so much this is so helpful. Would you be able to do a group 7 video? Thank you again

[@chemistrytutor]

Thanks for the feedback! Yes group 7 is on the list. First Redox, then Group 7 👍

[@savazedbagi2658]

Why did I not find these earlier

[@chemistrytutor]

It's not too late 😀

[@jillian9098]

Hi sir, thank you so much for these videos they genuinely help so much! I was wondering if u could make more full topic explained videos on year 13 inorganic and organic for this school year pls 🙏

[@chemistrytutor]

I'm really pleased they're useful! Those videos are definitely part of my plan for this year 👌

[@Mendeleev-hh8po]

Thank you so much, this is great! Loving the fact it's the whole topic in 16 minutes!!!

[@chemistrytutor]

Thanks for your kind words 😊

[@farqualeetali4022]

I have been stuck on this topic for the past 3 days, got my P4 in about a week. Thank you so much as this has helped me a ton. Any tips and tricks to remember all of the information, because that is the part I am having trouble with.

[@chemistrytutor]

Hi, I'm really glad it was useful! One of my tips is to try to remember rules and patterns, not all of the facts. Another is to remember that when you write ionic equations, if you remember the formula of the precipitate you can work out the aqueous ions in the reactant from there. Good luck!

[@TrishaLsg]

Hello sir, could you explain the trends in the Solubilities? For example solubility of goup2sulfates decreases as the lattice energy decreases. And so on😢

[@chemistrytutor]

@TrishaLsg The solubilities of Group 2 sulfates and hydroxides show opposite trends as you move down the group. Here’s an overview of each: Group 2 Sulfates: The solubility of Group 2 sulfates decreases down the group. This means: Magnesium sulfate (MgSO₄) is quite soluble in water. Calcium sulfate (CaSO₄) is less soluble. Strontium sulfate (SrSO₄) is sparingly soluble. Barium sulfate (BaSO₄) is practically insoluble in water. This decreasing trend is because the lattice energy (the energy required to break up the solid) remains relatively constant down the group, while the hydration energy (energy released when the ions interact with water) decreases significantly as the metal ions become larger. When the hydration energy decreases more than the lattice energy, the sulfate becomes less soluble. Group 2 Hydroxides: The solubility of Group 2 hydroxides increases down the group. This means: Magnesium hydroxide (Mg(OH)₂) is sparingly soluble in water. Calcium hydroxide (Ca(OH)₂) is moderately soluble. Strontium hydroxide (Sr(OH)₂) is more soluble. Barium hydroxide (Ba(OH)₂) is highly soluble, forming a strong alkaline solution. As you go down the group, the lattice energy of the hydroxide decreases more rapidly than the decrease in hydration energy, making it easier for the hydroxide ions to dissociate and thus increasing solubility. Summary: Sulfates: Solubility decreases down the group. Hydroxides: Solubility increases down the group. These trends are key to understanding reactions involving Group 2 compounds, such as the precipitation of barium sulfate in analytical chemistry or the use of calcium hydroxide in neutralizing acids.

[@malazahmed1911]

Thank you so much for these lessons, they’re giving me hope on actually getting through chemistry exams but can we get a video on period 3 oxides

[@chemistrytutor]

Hey, thanks for the feedback! I've done this for period 3 oxides... kzbin.info/www/bejne/ZnWuZp-Iq9V1oq8

[@AliciaMillin-b6h]

when I say i have never understood chemistry like i did watching this video i wish i was joking,THANK YOU so much you literally saved my exams

[@chemistrytutor]

Thank you for the lovely feedback! It's great to know the video helped! This links document might be useful. drive.google.com/file/d/1s3I5prjbJRR1U1lcKpXO9TQpQMaVoP66/view?usp=drivesdk Its updated continuously so I'd recommend using the links not a download

[@minnaminnaminnaminna]

Hi sir do we not need to know about flame testing group 2 elements? I might be getting mixed up

[@chemistrytutor]

It depends on your exam board. Most don't require it. For instance AQA don't have it as the core content. Some people (me included) make it a part of RP4 testing for Ions. When I make an RP video I will include it there

[@sulaiman8816]

Thank you so much, this is great! but sir i wonder why skip reactions with oxygen and not mention carbonates and nitrates.

[@chemistrytutor]

Thanks for the feedback, 😀 I based the video on the aqa specification and those things aren't in the group 2 section

[@lethehi]

never thought i can get so much help on internet, thank you so much teacher!

[@chemistrytutor]

You're welcome. Thanks for the feedback 😀

[@nikhilvijay5062]

thank you ever so much this was really helpful. Would you be able to do a video on group 17. Thanks loads again

[@chemistrytutor]

I'm really pleased it's useful! I'm currently working on redox, then it will be on to the halogens 😃

[@chemistrytutor]

Here you go... kzbin.info/www/bejne/kGiVd4l6rrl7p6s 😀

[@MichoRuby]

Am really greatful coming here gives me a go on , thanks

[@chemistrytutor]

@@MichoRuby thanks for the feedback 😀

[@ifty873]

inorganic has to be the worst part of chemistry

[@chemistrytutor]

There's definitely a lot to remember!

[@JosephPremium-fz9ep]

best chemistry teacher online right now, got paper 1 in 30 days been through your walkthroughs along with doing qs myself for physical yr2 and I feel 100x more confident on it thanks to you. I noticed on from your google drive you havent got anything on yr2 organic topics? any plans on doing those anytime soon would be extremely helpful :) and again, appreciate you putting out these videos because I dont know what id do without them, you make A level chemistry so easy and do able.

[@chemistrytutor]

I'm really pleased the videos are useful, thanks for the feedback! I have a few y13 videos, e.g. optical Isomers and Thermodynamics 1 and 2. I do have lots of question walkthroughs for year 2 though

[@nadernassr6636]

have you done halogens yet? thanks

[@chemistrytutor]

Yes indeed. Here you go... kzbin.info/www/bejne/kGiVd4l6rrl7p6s

[@Michael28pc]

7:16

[@chemistrytutor]

😀👍

[@chemmy8062]

Have you made a video on nitrogen and sulfur?

[@chemistrytutor]

I have not. There isn't a stand alone topic about that for aqa chemistry, so it wasn't a priority. What exam board do you do?

[@chemmy8062]

@@chemistrytutor Cambridge. If you ever get some free time, can you make a video on that topic. It's fine if you can't, I won't pressure you.

[@chemistrytutor]

@@chemmy8062 I'll add it to my list 😃