您所在的当前位置：高中化学试题 >

电解质溶液中离子浓度大小的比较

> 下列关于电解质溶液的叙述正确的是（　　） A．常温下，在pH=7的醋酸钠和醋酸混合溶液中：c（CH3COO-）＞c（Na+） B．稀释醋酸溶液，溶液中所有离子的浓度均降低 C．在pH=5的氯化钠和稀硝酸的混合溶液中，c（Na+）=c（Cl-） D．0.1mol•L-1的硫化钠溶液中，c（OH-）=c（H+）+c（HS-）+c（H2S）

问题：

发布时间：2024-09-10

下列关于电解质溶液的叙述正确的是（　　）

A．常温下，在pH=7的醋酸钠和醋酸混合溶液中：c（CH₃COO^-）＞c（Na⁺）

B．稀释醋酸溶液，溶液中所有离子的浓度均降低

C．在pH=5的氯化钠和稀硝酸的混合溶液中，c（Na⁺）=c（Cl^-）

D．0.1mol•L^-1的硫化钠溶液中，c（OH^-）=c（H⁺）+c（HS^-）+c（H₂S）

参考答案：

提问用户：bL***K1j

可能感兴趣的题目：

1 下列属于文化现象的是 A．爆发金融危机 B．召开人大政协会议 C．张家界的自然风光 D．观看春节文艺晚会
2 下列属于有机物的是(　　) A．CO B．CaCO3 C．CH3CH2OH D．H2CO3
3 温家宝指出，2010年我们要努力工作，切实解决好民生问题，千方百计创造更多的就业机会，持续提高城乡居民的收入水平，使人民群众老有所养、病有所医、住有所居。这里体现的哲学观点是 [ ] A．坚持群众观点和群众路线 B．实践是检验真理的标准 C．在劳动和奉献中实现人生的价值 D．真理与谬误相互转化
4 现在，吃饭有饭店送餐，洗衣送洗衣店，家庭清洁请钟点工上门。买，洗，烧都发包出去了，家庭服务外包成为许多人新的生活方式。家庭服务外包方面的消费属于 [ ] A．发展消费 B．生存资料消费 C．劳务消费 D．物质资料消费
5 第三部分阅读理解（共15小题，每题2分，满分30分）请认真阅读下列短文，从短文后各题所给的四个选项（A、B、C和D）中，选出最佳选项并在答题卡上将该项涂黑。 We find that bright children are seldom held back by mixed-ability teaching. On the contrary, both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming(按能力分班) pupils. It does not consider the fact that children develop at different rates. It can have had effect on both the bright and the not-so-bright children. After all, it can be quite discouraging to be the bottom of the top grade. Besides, it is rather unreal to grade people just according to their intellectual(智力) ability. This is only one aspect of their total personality. We care much about the development of all the pupils’ abilities to the full, not just their study ability. We also value personal qualities and social skills, and we find that mixed-ability teaching does good to these aspects of learning. In our classrooms, we work in various ways. The pupils often work in groups; this gives them the chance to learn to work together, to share, and to develop leadership skills. They also learn how to deal with personal problems as well as learning how to think, to make decisions, to analyze(分析) an devaluate(评价) and to communicate effectively. The pupils learn from each other as well as from the teachers. Sometimes the pupils work in pairs; sometimes they work on individual(个人) tasks, and they can do this at their own speed. They also have some formal class teaching when this is proper. We encourage our pupils to use the library, and we teach them the skills they need in order to do this well. An advanced pupil can do advanced work and it does not matter what age the child is. We expect our pupils to do their best, not their least, and we give them every encouragement to achieve this goal. 56. By “held back” in the first paragraph, the writer means “________”. A. made to remain in the same class B. forced to study in the lower class C. drawn away form their studies D. prevented from advancing 57. The writer’s purpose of writing this passage is to ________. A. argue for teaching bright and not-so-bright pupils in the same class B. advise pair work and group work for classroom activity C. offer advice on the proper use of the library D. tell us the importance of proper formal classroom teaching 58. What would be the best title for the text? A. Pair work. B. Group work. C. Mixed-ability teaching D. Individual tasks.
6 如图甲所示，水平放置足够长的平行金属导轨，左右两端分别接有一个阻值为 R的电阻，匀强磁场与导轨平面垂直，质量 m =" 0.1" kg、电阻 r = 的金属棒置于导轨上，与导轨垂直且接触良好。现用一拉力 F =（0.3+0.2 t）N作用在金属棒上，经过2s后撤去 F，再经过0.55s金属棒停止运动。图乙所示为金属棒的 v– t图象， g = 10m/s 2。求：小题1:金属棒与导轨之间的动摩擦因数；小题2:整个过程中金属棒运动的距离；小题3:从撤去 F到金属棒停止的过程中，每个电阻 R上产生的焦耳热。
7 有人将法德的关系作如下比喻：原来两国都在同一条马路上开车，各有各的交通规则，法国采取了“民主”规则，德国采取了专制规则，结果一再撞车。现在仍旧在同一条马路上开车，大家都遵守相同的“民主”规则，不再撞车了。这里第二个“民主”的含义是指 A．民主政治的不断发展 B．民主权利的逐步扩大 C．欧洲的经济一体化 D．法德关系的和解
8 如图所示，一轻质弹簧下端固定在水平地面上，上端与物体A连接，物体A又与一跨过定滑轮的不可伸长的轻绳一端相连，绳另一端悬挂着物体B，B的下面又挂着物体C，A、B、C均处于静止状态。现剪断B和C之间的绳子，在A、B运动过程中，弹簧始终在弹性限度范围内。（已知弹簧的劲度系数为k，物体A质量为3m，B和C质量均为2m）试求：（1）物体A的最大速度；（2）轻绳对物体B的最大拉力和最小拉力。
9 如图2所示，劲度系数分别为k 1=30N/m,k 2=50N/m轻弹簧竖直挂着，两弹簧之间有一质量为m 1=2kg重物，最下端挂一质量为m 2=4kg重物，现用力F竖直向上托起m 2，当力F为 N 时，两弹簧总长等于两弹簧原长之和。（取g=10m/s 2）
10 已知函数在处取得最大值,则( ) A．函数一定是奇函数 B．函数一定是偶函数 C．函数一定是奇函数 D．函数一定是偶函数