Why primary standard solutions wouldn't always be used in standardisation ?

[erfan]

why secondary standard solution are used for standardisation ?

[hypervalent_iodine]

Standardisation of what, exactly?

[erfan]

to analyse the ethanoic acid present in vinegar,i used potassium hydrogen phthalate to standardise the sodium hydroxide (my secondary standard )

why the primary standard in this practical is not suitable for standardising a solution of ammonia ?

[John Cuthber]

What do you know about ammonia and sodium hydroxide?

[erfan]

If I was sure about my knowledges I would never ask about help..

[John Cuthber]

Do you know that ammonia is not nearly as strong a base as sodium hydroxide?

[erfan]

YES ,then??

[John Cuthber]

Have you actually tried reading about this, or even thinking about it? Are you just hoping that someone will spoon feed you the answer?

[erfan]

ohhhh god,,ok just forget my question..

i hate chemistry and im not interested in learning it.

and really u don't wanna help me,,U r just judging me..

tnx.bye

[emjay]

just want to say that you- that is John Cuthbert - whether knowingly or unknowingly have treated Erfan in a horrible manner. i think you should be ashamed of yourself.

sorry - i feel a bit angry about your responses to him (or her).

Erfan - don't get too disheartened. just remember that you don't need to understand 100% of chemistry to be good at it or to pass it or to enjoy it.

[John Cuthber]

He asked a question that was too vague to answer and I'm pretty sure he asked it in the wrong part of the forum because I think it was a homework question.

Hypervalent iodine asked him to clarify that question, and he did.

I could have just given him an answer- but then so could a textbook or Google.

Instead I tried to get him to think for himself. In my opinion that's a valid teaching method.

The problem is that it only works if the student is prepared to put in some effort.

He didn't seem to have put in a lot of effort, so I gave him another hint.

He still seemed unwilling to bother trying to help himself so I gave up.

 

That's the only judgement I made- I judged that he wasn't putting any effort into finding out- so why should I do all the work.

 

I'm quite happy to help people but, let's face it, I don't get paid for this. Why should I do all the work?

[mississippichem]

Spoon feeding never helped anyone. Let someone learn something on their own, with gentle nudges from those more knowledgeable, and you've changed their life for the better as they will remember the concept and will recall where it came from years down the road.