Question

17£®ÔÚÓÃ4%ÇâÑõ»¯ÄÆÈÜÒººÍÈÜÖÊÖÊÁ¿·ÖÊýΪ4.9%µÄÏ¡ÁòËá½øÐÐËá¼îʵÑéʱ£¬·´Ó¦¹ý³ÌÖÐÈÜÒºËá¼î¶È±ä»¯¼°Ïà¹ØÊý¾ÝÈçͼËùʾ£® 
£¨1£©¸ù¾Ý´Ë±ä»¯ÇúÏߣ¬ÄãÈÏΪʵÑé²Ù×÷Êǽ«ÇâÑõ»¯ÄÆÈÜÒºµÎ¼Óµ½ÁíÒ»ÖÖÈÜÒºÖÐ
£¨2£©µ±¼ÓÈëÈÜÒºµÄÖÊÁ¿ÊÇA¿Ëʱ£¬µÎÈëÎÞÉ«·Ó̪ÊÔÒº£¬ÈÜÒº³ÊÎÞÉ«£¬´ËʱÈÜÒºÖÐÈÜÖÊÊÇH₂SO₄ºÍNa₂SO₄£®
£¨3£©ÇóÇ¡ºÃÍêÈ«·´Ó¦ºóËùµÃÈÜÒºÖÐÈÜÖʵÄÖÊÁ¿£¨Ðèд³ö¼ÆËã¹ý³Ì£©£®
£¨·´Ó¦µÄ»¯Ñ§·½³Ìʽ£º2NaOH+H₂SO₄=Na₂SO₄+H₂O£©

Answer 1

·ÖÎö £¨1£©¸ù¾Ý¿ªÊ¼Ê±ÈÜÒºµÄpHСÓÚ7£¬¿ÉÒÔÅжϳöÊǽ«ÇâÑõ»¯ÄÆÈÜÒºµÎ¼ÓÁòËáÈÜÒºÖУ»
£¨2£©¸ù¾ÝÈÜÒºµÄpHСÓÚ7³Ê¼îÐÔ½øÐнâ´ð
£¨3£©µ±ÈÜÒºµÄpHµÈÓÚ7ʱ£¬ËµÃ÷Ç¡ºÃÍêÈ«·´Ó¦£¬¸ù¾Ý¼ÓÈëÇâÑõ»¯ÄÆÈÜÒºµÄÁ¿Çó³öÈÜÖʵÄÖÊÁ¿£®

½â´ð ½â£º£¨1£©¿ªÊ¼Ê±ÈÜÒºµÄpHСÓÚ7£¬ËµÃ÷ÈÜÒº³ÊËáÐÔ£¬ÎªÁòËáÈÜÒº£¬ËùÒÔʵÑé²Ù×÷Êǽ«ÇâÑõ»¯ÄÆÈÜÒºµÎ¼Óµ½ÁòËáÈÜÒºÖУ»¹ÊÌÇâÑõ»¯ÄÆÈÜÒº£»
£¨2£©µ±¼ÓÈëÈÜÒºµÄÖÊÁ¿ÊÇA¿Ëʱ£¬ÈÜÒºµÄpHСÓÚ7£¬³ÊËáÐÔ£¬µÎÈëÎÞÉ«·Ó̪ÊÔÒºÈÜÒº³ÊÎÞÉ«£¬´Ëʱ˵Ã÷ÇâÑõ»¯ÄƺÍÒ»²¿·ÖÁòËá·´Ó¦£¬ÁòËáÓÐÊ£Ó࣬´ËʱÈÜÒºÖÐÈÜÖÊÊÇH₂SO₄ºÍNa₂SO₄£»¹ÊÌÎÞ£»H₂SO₄ºÍNa₂SO₄£»
£¨3£©½â£ºÉèÇ¡ºÃÍêÈ«·´Ó¦Ê±ÈÜÖʵÄÖÊÁ¿Îªx
2NaOH+H₂SO₄=Na₂SO₄+H₂O
 80                    142
20g¡Á4%               x
$\frac{80}{20g¡Á4%}=\frac{142}{x}$
x=14.2g
´ð£ºÇ¡ºÃÍêÈ«·´Ó¦Ê±ÈÜÖÊÖÊÁ¿Îª14.2g£®

µãÆÀ ±¾ÌâÒÔͼÏóµÄÐÎʽ¿¼²éÁËËá¼îÖкͷ´Ó¦Ê±ÈÜÒºpHµÄ±ä»¯£¬ÒÔ¼°ÎïÖʼäµÄÖÊÁ¿¹Øϵ£¬Íê³É´ËÌ⣬¿ÉÒÔÒÀ¾ÝÒÑÓеÄ֪ʶ½øÐУ®