（12分）现从固体KOH出发配制0.1mol/L 的KOH溶液 500mL，回答下列问题：

（1）配制过程中需要用到的玻璃仪器有烧杯、玻璃棒、量筒、胶头滴管、           

（2）如果在定容时仰视操作，则所配得溶液的浓度       0.1mol/L（填> , =" ," <）

（3）若所用的固体KOH中混有NaOH，则所配得溶液的OH^-浓度   0.1mol/L（填> , =" ," <）

（4）若用250mL的H₂SO₄溶液恰好能将此500mL 0.1mol/L 的KOH溶液中和，则该硫酸的物质的量浓度为        mol/L

短文改错。

     This autumn my class went to Dalian to go the camping. We arrived at a sandy beach with a well view of the sea. We set up our tents on the sandy beach, when night fell we made a fire to give us light and kept us warm. All the classmates sat around them, talking and laughing. Several hours late, Li Mei and I went

back to the tent to have a chat. We stayed up all of night. We found that we two had a lot of common. For instance, we both like the same singers and have great enthusiasm for physics. The fire and the stars see

our happiness. What I wished time would stop at that moment!

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