[討論] log問題
版上的大師們,
我的化學真的爛到一個爆點,
log 問題,
卡了好久想不通,
請各位不吝解惑~~(鞠躬)
題目是Wade organic chemistry 第23頁的練習題:
Calculate the pH of the following solution:
A> 5.00g of HBr in 100ml of aqueous solution
5x1/80.9= 0.0618
0.0618/100ml x 1000ml/1L = 0.618
這邊就是我想不出來的地方了:
pH=-log (0.618)= 0.209
這個0.209 怎麼算出來的?
B> 1.50 g of NaOH in 50ml of aqueous solution
1.5x 1/40=0.0375
0.0375/50 x1000/1=0.75
然後又卡在這邊:
我算不出來 pH 等於13.88 ?
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