IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Amelia on January 09, 2010, 04:38:21 pm

Title: Chemistry questions. (help needed)
Post by: Amelia on January 09, 2010, 04:38:21 pm

1) Calculate the pH of the buffer solution made by mixing 60cm^3  of 0.20 moldm^3 solution with 40 cm of sodium hydroxide of oncentration 0.1 moldm cube. Ka - 1.8x10^-5/dm^3.

2)calulate the relative volumes of 1 moldm^-3 solution of ethanoic acid and 1moldm^-3 solution of sodium ethanoate that have to be mixed to give a solution of 4.00. Ka - 1.8x10^-5

3) The solubility of lead chloride at 20 degree celciusis 0.70gm per 100cm^3 of solution. What is the solublity product of this solution?


Please answer them for me.

Title: Re: Chemistry questions. (help needed)
Post by: Amelia on January 10, 2010, 03:21:46 pm

Dnt tell me this questiongs r tough even for u guys :'(