题目

How to Plan a Holiday TripEach year, millions of people load up the family car and set out on a holiday trip. Whether it's to grandma's house, a family reunion or simply a holiday getaway, these yearly road trips can often be the source of tiredness and stress. The thought of being trapped in the car with restless children or the possibility of car trouble along the way is enough to make anyone consider staying home.【1】Plan out the route for your car trip. If you're planning on driving to your holiday destination, a little planning can help make your trip easy.【2】 Remember, it's likely在如图用石墨作电极的电解池中，放入500 mL含一种溶质的某蓝色溶液进行电解，观察到A电极表面有红色的固态物质生成，B电极有无色气体生成；当溶液中的原有溶质完全电解后，停止电解，取出A电极，洗涤、干燥、称量、电极增重1.6 g。请回答下列问题；(1)A接的是电源的________极，B是该装置______极(2)写出电解时反应的总离子方程式_______________(3)电解后溶液的pH为________；要使电解后溶液恢复到电解前的状态，则需加入________，其质量为________。(假设电解前后溶液的体积不变)