QUOTE(nicoleycc @ Oct 27 2008, 12:19 AM)
then become temporary teacher or apply for maktab or choose education course in uni after this ..
u will not leave the school..LOL
which of the following solutions has the highest concentration of hydroxide ion?
A. 50 cm3 of 2 mol dm-3 aqueous ammonia
B. 50 cm3 of 1 mol dm-3 potassium hydroxide
C. 20cm3 of 2 mol dm-3 sodium hydroxide
D. 50cm3 of 5 mol dm-3 zinc hydroxide.
yea...just use MV/1000 to find the mol, then u will know..
always think to find the mol if u r given concentration and volume
then, u will be able to determine which one has the highest concentration of OH-
A. 1x 10-4
B. 5x 10 -5
C. 4x 10-5
D. 5x 10-3 [multiply 2 to the mol u find(2.5x10-3 beacuse it is Zn(OH)2 ]
Added on October 27, 2008, 12:23 am
geng, V3.. study smart yea
best of luck to all the SPM students here..
Erm.. are you sure the decimal is that much? I only get numbers like 2 decimal places..u will not leave the school..LOL
which of the following solutions has the highest concentration of hydroxide ion?
A. 50 cm3 of 2 mol dm-3 aqueous ammonia
B. 50 cm3 of 1 mol dm-3 potassium hydroxide
C. 20cm3 of 2 mol dm-3 sodium hydroxide
D. 50cm3 of 5 mol dm-3 zinc hydroxide.
yea...just use MV/1000 to find the mol, then u will know..
always think to find the mol if u r given concentration and volume
then, u will be able to determine which one has the highest concentration of OH-
A. 1x 10-4
B. 5x 10 -5
C. 4x 10-5
D. 5x 10-3 [multiply 2 to the mol u find(2.5x10-3 beacuse it is Zn(OH)2 ]
Added on October 27, 2008, 12:23 am
geng, V3.. study smart yea
best of luck to all the SPM students here..
Oct 27 2008, 01:36 AM

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